Find new, used, and certified pre-owned Buick GMC cars and trucks for sale in Oklahoma City, OK, at Bob Howard Buick GMC. Shop for the GMC Sierra 1500, Buick Encore, Buick Enclave, GMC Acadia, and other popular models in-person or buy Buick GMC online in the Oklahoma City area from the convenience of your own home. Our entire available inventory of New, Used, and Certified Pre-Owned Buick GMC cars and trucks are just a click away. Se habla español.
New Buick GMC | Used Cars & Trucks | CPO Buick GMC | Buy Buick GMC Online
New 2020 GMC Sierra 1500 Crew Cab Short Box 4-Wheel Drive SLT
- Sale Price $45,400
- MSRP $56,400
See Important Disclosures Here
Specifications
- Exterior Satin Steel Metallic
- Engine 5.3L Ecotec3 V8 Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK10543
- MSRP $56,400
- Stock Number LG358354
- Transmission automatic
- VIN 3GTU9DED0LG358354
- Mileage 15
Current Offers
- MSRP $56,400
- Bob Howard Price $52,400
- - $7,000 Take Retail Delivery By 8/31/20Purchase Allowance 120-40ACA:10 Consumer Cash Program
- Sale Price $45,400
- You Save $11,000
Other Offers You May Qualify For
-
- $750 Take Retail Delivery By 8/31/20 - Not Compatible with Some Other OffersPurchase Allowance for Current Eligible FCA Owners220-40CAY:0 GM Conquest Program
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Must be a current
owner or lessee of a 2006 or newer Chrysler, Dodge, Jeep or Ram passenger car
or truck for at least 30 days prior to the new vehicle sale. Customer remains
responsible for current lease payments. Not available with some other offers.
New 2020 GMC Sierra 1500 Crew Cab Short Box 4-Wheel Drive SLE
- Sale Price $43,430
- MSRP $53,430
See Important Disclosures Here
Specifications
- Exterior Onyx Black
- Engine 5.3L Ecotec3 V8 Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK10543
- MSRP $53,430
- Stock Number LG177079
- Transmission automatic
- VIN 3GTU9BED2LG177079
- Mileage 15
Current Offers
- MSRP $53,430
- Bob Howard Price $49,430
- - $6,000 Take Retail Delivery By 8/31/20Purchase Allowance 120-40ACA:10 Consumer Cash Program
- Sale Price $43,430
- You Save $10,000
Other Offers You May Qualify For
-
- $750 Take Retail Delivery By 8/31/20 - Not Compatible with Some Other OffersPurchase Allowance for Current Eligible FCA Owners220-40CAY:0 GM Conquest Program
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Must be a current
owner or lessee of a 2006 or newer Chrysler, Dodge, Jeep or Ram passenger car
or truck for at least 30 days prior to the new vehicle sale. Customer remains
responsible for current lease payments. Not available with some other offers.
New 2020 GMC Sierra 1500 Crew Cab Short Box 4-Wheel Drive SLT
- Sale Price $52,785
- MSRP $62,785
See Important Disclosures Here
Specifications
- Exterior Onyx Black
- Engine 3.0L Straight 6-Cyl Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK10543
- MSRP $62,785
- Stock Number LG200657
- Transmission automatic
- VIN 3GTU9DET8LG200657
- Mileage 801
Current Offers
- MSRP $62,785
- Bob Howard Price $58,785
- - $6,000 Take Retail Delivery By 8/31/20Purchase Allowance 120-40ACA:10 Consumer Cash Program
- Sale Price $52,785
- You Save $10,000
Other Offers You May Qualify For
-
- $750 Take Retail Delivery By 8/31/20 - Not Compatible with Some Other OffersPurchase Allowance for Current Eligible FCA Owners220-40CAY:0 GM Conquest Program
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Must be a current
owner or lessee of a 2006 or newer Chrysler, Dodge, Jeep or Ram passenger car
or truck for at least 30 days prior to the new vehicle sale. Customer remains
responsible for current lease payments. Not available with some other offers.
New 2020 GMC Sierra 1500 Crew Cab Short Box 4-Wheel Drive AT4
- Sale Price $76,621
- MSRP $64,935
See Important Disclosures Here
Specifications
- Exterior Onyx Black
- Engine 6.2L Ecotec3 V8 Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK10543
- MSRP $64,935
- Stock Number LG268961
- Transmission automatic
- VIN 3GTP9EEL6LG268961
- Mileage 12
Current Offers
- MSRP $64,935
- Bob Howard Price $60,935
- + $21,686Black Widow Package 1SCA Performance Black Widow Package
- - $6,000 Take Retail Delivery By 8/31/20Purchase Allowance 220-40ACA:10 Consumer Cash Program
- Sale Price $76,621
- You Save $10,000
Other Offers You May Qualify For
-
- $750 Take Retail Delivery By 8/31/20 - Not Compatible with Some Other OffersPurchase Allowance for Current Eligible FCA Owners320-40CAY:0 GM Conquest Program
Click here for more offer information
1Full Warranty applies.
2Not available with special financing, lease and some other offers.
3Must be a current
owner or lessee of a 2006 or newer Chrysler, Dodge, Jeep or Ram passenger car
or truck for at least 30 days prior to the new vehicle sale. Customer remains
responsible for current lease payments. Not available with some other offers.
New 2020 GMC Yukon XL 4WD 4dr Denali
- Bob Howard Price $69,850
- MSRP $79,850
See Important Disclosures Here
Specifications
- Exterior Onyx Black
- Engine 6.2L Ecotec3 V8 Engine
- Interior Jet Black
- Location Bob Howard Buick GMC
- Model Code TK15906
- MSRP $79,850
- Stock Number LR277081
- Transmission 10-Speed A/T
- VIN 1GKS2HKJ0LR277081
- Mileage 10
Pricing Information
- MSRP $79,850
- Bob Howard Price $69,850
- You Save $10,000
New 2020 GMC Yukon XL 4WD 4dr Denali
- Bob Howard Price $69,850
- MSRP $79,850
See Important Disclosures Here
Specifications
- Exterior Onyx Black
- Engine 6.2L Ecotec3 V8 Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK15906
- MSRP $79,850
- Stock Number LR286837
- Transmission 10-Speed A/T
- VIN 1GKS2HKJ8LR286837
- Mileage 5
Pricing Information
- MSRP $79,850
- Bob Howard Price $69,850
- You Save $10,000
New 2020 GMC Yukon XL 4WD 4dr Denali
- Bob Howard Price $69,850
- MSRP $79,850
See Important Disclosures Here
Specifications
- Exterior Onyx Black
- Engine 6.2L Ecotec3 V8 Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK15906
- MSRP $79,850
- Stock Number LR282924
- Transmission 10-Speed A/T
- VIN 1GKS2HKJ5LR282924
- Mileage 19
Pricing Information
- MSRP $79,850
- Bob Howard Price $69,850
- You Save $10,000
New 2020 GMC Yukon XL 4WD 4dr Denali
- Bob Howard Price $70,150
- MSRP $80,150
See Important Disclosures Here
Specifications
- Exterior Satin Steel Metallic
- Engine 6.2L Ecotec3 V8 Engine
- Interior Jet Black
- Location Bob Howard Buick GMC
- Model Code TK15906
- MSRP $80,150
- Stock Number LR276494
- Transmission 10-Speed A/T
- VIN 1GKS2HKJ9LR276494
- Mileage 24
Pricing Information
- MSRP $80,150
- Bob Howard Price $70,150
- You Save $10,000
New 2020 GMC Yukon XL 4WD 4dr Denali
- Bob Howard Price $70,150
- MSRP $80,150
See Important Disclosures Here
Specifications
- Exterior Satin Steel Metallic
- Engine 6.2L Ecotec3 V8 Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK15906
- MSRP $80,150
- Stock Number LR284087
- Transmission 10-Speed A/T
- VIN 1GKS2HKJ3LR284087
- Mileage 6
Pricing Information
- MSRP $80,150
- Bob Howard Price $70,150
- You Save $10,000
New 2020 GMC Yukon XL 4WD 4dr Denali
- Bob Howard Price $70,750
- MSRP $80,750
See Important Disclosures Here
Specifications
- Exterior White Frost Tricoat
- Engine 6.2L Ecotec3 V8 Engine
- Interior Jet Black
- Location Bob Howard Buick GMC
- Model Code TK15906
- MSRP $80,750
- Stock Number LR279867
- Transmission 10-Speed A/T
- VIN 1GKS2HKJ4LR279867
- Mileage 10
Pricing Information
- MSRP $80,750
- Bob Howard Price $70,750
- You Save $10,000
New 2020 GMC Yukon XL 4WD 4dr Denali
- Bob Howard Price $70,750
- MSRP $80,750
See Important Disclosures Here
Specifications
- Exterior White Frost Tricoat
- Engine 6.2L Ecotec3 V8 Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK15906
- MSRP $80,750
- Stock Number LR284640
- Transmission 10-Speed A/T
- VIN 1GKS2HKJ1LR284640
- Mileage 6
Pricing Information
- MSRP $80,750
- Bob Howard Price $70,750
- You Save $10,000
New 2020 Buick Envision AWD 4dr Essence
- Sale Price $32,880
- MSRP $42,130
See Important Disclosures Here
Specifications
- Exterior Summit White
- Engine 2.5L 4 cyl
- Interior Ebony
- Location Bob Howard Buick GMC
- Model Code 4XZ26
- MSRP $42,130
- Stock Number LD079983
- Transmission 6-Speed A/T
- VIN LRBFX2SA4LD079983
- Mileage 54
Current Offers
- MSRP $42,130
- Bob Howard Price $38,130
- - $3,250 Take Retail Delivery By 8/31/20Purchase Allowance 120-40ACA:10 Consumer Cash Program
- - $2,000 Take Retail Delivery By 8/31/20Select Market Bonus Cash 220-40AS:3 Buick Select Market Bonus Cash Program
- Sale Price $32,880
- You Save $9,250
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Not available with lease and some other offers. Residency restrictions apply.
New 2020 GMC Sierra 2500HD Crew Cab Standard Box 4-Wheel Drive SLT
- Sale Price $66,680
- MSRP $75,680
See Important Disclosures Here
Specifications
- Exterior Onyx Black
- Engine Duramax 6.6L Turbo-Diesel V8 B20-Diesel Compatible Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK20743
- MSRP $75,680
- Stock Number LF270342
- Transmission automatic
- VIN 1GT49NEYXLF270342
- Mileage 18
Current Offers
- MSRP $75,680
- Bob Howard Price $70,680
- - $4,000 Take Retail Delivery By 8/31/20Purchase Allowance 120-40ACA:10 Consumer Cash Program
- Sale Price $66,680
- You Save $9,000
Click here for more offer information
1Not available with special financing, lease and some other offers.
New 2020 GMC Sierra 2500HD Crew Cab Standard Box 4-Wheel Drive Denali
- Sale Price $70,110
- MSRP $79,110
See Important Disclosures Here
Specifications
- Exterior White Frost Tricoat
- Engine Duramax 6.6L Turbo-Diesel V8 B20-Diesel Compatible Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK20743
- MSRP $79,110
- Stock Number LF270670
- Transmission automatic
- VIN 1GT49REY6LF270670
- Mileage 20
Current Offers
- MSRP $79,110
- Bob Howard Price $74,110
- - $4,000 Take Retail Delivery By 8/31/20Purchase Allowance 120-40ACA:10 Consumer Cash Program
- Sale Price $70,110
- You Save $9,000
Click here for more offer information
1Not available with special financing, lease and some other offers.
New 2020 GMC Sierra 2500HD Crew Cab Standard Box 4-Wheel Drive SLT
- Sale Price $84,768
- MSRP $76,275
See Important Disclosures Here
Specifications
- Exterior Onyx Black
- Engine Duramax 6.6L Turbo-Diesel V8 B20-Diesel Compatible Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK20743
- MSRP $76,275
- Stock Number LF256813
- Transmission automatic
- VIN 1GT49NEY8LF256813
- Mileage 32
Current Offers
- MSRP $76,275
- Bob Howard Price $71,275
- + $17,493Black Widow Package 1Black Widow Package by SCA Performance
- - $4,000 Take Retail Delivery By 8/31/20Purchase Allowance 220-40ACA:10 Consumer Cash Program
- Sale Price $84,768
- You Save $9,000
Click here for more offer information
1Full warranty in effect. All Rebates applied. W.A.C.
2Not available with special financing, lease and some other offers.
New 2020 Buick Envision FWD 4dr Essence
- Sale Price $29,916
- MSRP $37,985
See Important Disclosures Here
Specifications
- Exterior Dark Moon Blue Metallic
- Engine 2.5L 4 cyl
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code 4XS26
- MSRP $37,985
- Stock Number LD127321
- Transmission 6-Speed A/T
- VIN LRBFXCSA5LD127321
- Mileage 10
Current Offers
- MSRP $37,985
-
Price Reduction Below MSRP- $2,818Manufacturer's Incentive
-
$35,166Special Value Price120-40AX:1 GM Employee Pricing For Everyone Program
- - $3,250 Take Retail Delivery By 8/31/20Purchase Allowance 220-40ACA:10 Consumer Cash Program
- - $2,000 Take Retail Delivery By 8/31/20Select Market Bonus Cash 320-40AS:3 Buick Select Market Bonus Cash Program
- Sale Price $29,916
- You Save $8,068
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Not available with special financing, lease and some other offers.
3Not available with lease and some other offers. Residency restrictions apply.
New 2020 Buick Envision FWD 4dr Essence
- Sale Price $29,483
- MSRP $37,490
See Important Disclosures Here
Specifications
- Exterior Ebony Twilight Metallic
- Engine 2.5L 4 cyl
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code 4XS26
- MSRP $37,490
- Stock Number LD160163
- Transmission 6-Speed A/T
- VIN LRBFXCSA2LD160163
- Mileage 11
Current Offers
- MSRP $37,490
-
Price Reduction Below MSRP- $2,756Manufacturer's Incentive
-
$34,733Special Value Price120-40AX:1 GM Employee Pricing For Everyone Program
- - $3,250 Take Retail Delivery By 8/31/20Purchase Allowance 220-40ACA:10 Consumer Cash Program
- - $2,000 Take Retail Delivery By 8/31/20Select Market Bonus Cash 320-40AS:3 Buick Select Market Bonus Cash Program
- Sale Price $29,483
- You Save $8,006
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Not available with special financing, lease and some other offers.
3Not available with lease and some other offers. Residency restrictions apply.
New 2020 Buick Envision FWD 4dr Essence
- Sale Price $29,483
- MSRP $37,490
See Important Disclosures Here
Specifications
- Exterior Espresso Metallic
- Engine 2.5L 4 cyl
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code 4XS26
- MSRP $37,490
- Stock Number LD160229
- Transmission 6-Speed A/T
- VIN LRBFXCSA6LD160229
- Mileage 10
Current Offers
- MSRP $37,490
-
Price Reduction Below MSRP- $2,756Manufacturer's Incentive
-
$34,733Special Value Price120-40AX:1 GM Employee Pricing For Everyone Program
- - $3,250 Take Retail Delivery By 8/31/20Purchase Allowance 220-40ACA:10 Consumer Cash Program
- - $2,000 Take Retail Delivery By 8/31/20Select Market Bonus Cash 320-40AS:3 Buick Select Market Bonus Cash Program
- Sale Price $29,483
- You Save $8,006
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Not available with special financing, lease and some other offers.
3Not available with lease and some other offers. Residency restrictions apply.
New 2020 GMC Sierra 1500 Double Cab Standard Box 4-Wheel Drive Elevation
- Sale Price $39,105
- MSRP $47,105
See Important Disclosures Here
Specifications
- Exterior Pacific Blue Metallic
- Engine 2.7L 4-Cyl Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK10753
- MSRP $47,105
- Stock Number LZ154317
- Transmission automatic
- VIN 1GTR9CEK6LZ154317
- Mileage 254
Current Offers
- MSRP $47,105
- Bob Howard Price $43,105
- - $4,000 Take Retail Delivery By 8/31/20Purchase Allowance 120-40ACA:10 Consumer Cash Program
- Sale Price $39,105
- You Save $8,000
Click here for more offer information
1Not available with special financing, lease and some other offers.
New 2020 GMC Sierra 1500 Crew Cab Short Box 4-Wheel Drive AT4
- Sale Price $61,530
- MSRP $69,530
See Important Disclosures Here
Specifications
- Exterior Onyx Black
- Engine 6.2L Ecotec3 V8 Engine
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code TK10543
- MSRP $69,530
- Stock Number LZ310909
- Transmission automatic
- VIN 1GTP9EEL7LZ310909
- Mileage 8
Current Offers
- MSRP $69,530
- Bob Howard Price $67,530
- - $6,000 Take Retail Delivery By 8/31/20Purchase Allowance 120-40ACA:10 Consumer Cash Program
- Sale Price $61,530
- You Save $8,000
Other Offers You May Qualify For
-
- $750 Take Retail Delivery By 8/31/20 - Not Compatible with Some Other OffersPurchase Allowance for Current Eligible FCA Owners220-40CAY:0 GM Conquest Program
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Must be a current
owner or lessee of a 2006 or newer Chrysler, Dodge, Jeep or Ram passenger car
or truck for at least 30 days prior to the new vehicle sale. Customer remains
responsible for current lease payments. Not available with some other offers.
New 2020 Buick Envision FWD 4dr Preferred
- Sale Price $27,573
- MSRP $35,415
See Important Disclosures Here
Specifications
- Exterior Ebony Twilight Metallic
- Engine 2.5L 4 cyl
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code 4XR26
- MSRP $35,415
- Stock Number LD159874
- Transmission 6-Speed A/T
- VIN LRBFXBSA5LD159874
- Mileage 11
Current Offers
- MSRP $35,415
-
Price Reduction Below MSRP- $2,591Manufacturer's Incentive
-
$32,823Special Value Price120-40AX:1 GM Employee Pricing For Everyone Program
- - $3,250 Take Retail Delivery By 8/31/20Purchase Allowance 220-40ACA:10 Consumer Cash Program
- - $2,000 Take Retail Delivery By 8/31/20Select Market Bonus Cash 320-40AS:3 Buick Select Market Bonus Cash Program
- Sale Price $27,573
- You Save $7,841
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Not available with special financing, lease and some other offers.
3Not available with lease and some other offers. Residency restrictions apply.
New 2020 Buick Envision FWD 4dr Preferred
- Sale Price $27,573
- MSRP $35,415
See Important Disclosures Here
Specifications
- Exterior Ebony Twilight Metallic
- Engine 2.5L 4 cyl
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code 4XR26
- MSRP $35,415
- Stock Number LD159960
- Transmission 6-Speed A/T
- VIN LRBFXBSA9LD159960
- Mileage 5
Current Offers
- MSRP $35,415
-
Price Reduction Below MSRP- $2,591Manufacturer's Incentive
-
$32,823Special Value Price120-40AX:1 GM Employee Pricing For Everyone Program
- - $3,250 Take Retail Delivery By 8/31/20Purchase Allowance 220-40ACA:10 Consumer Cash Program
- - $2,000 Take Retail Delivery By 8/31/20Select Market Bonus Cash 320-40AS:3 Buick Select Market Bonus Cash Program
- Sale Price $27,573
- You Save $7,841
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Not available with special financing, lease and some other offers.
3Not available with lease and some other offers. Residency restrictions apply.
New 2020 Buick Envision FWD 4dr Preferred
- Sale Price $27,573
- MSRP $35,415
See Important Disclosures Here
Specifications
- Exterior Satin Steel Metallic
- Engine 2.5L 4 cyl
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code 4XR26
- MSRP $35,415
- Stock Number LD160132
- Transmission 6-Speed A/T
- VIN LRBFXBSAXLD160132
- Mileage 11
Current Offers
- MSRP $35,415
-
Price Reduction Below MSRP- $2,591Manufacturer's Incentive
-
$32,823Special Value Price120-40AX:1 GM Employee Pricing For Everyone Program
- - $3,250 Take Retail Delivery By 8/31/20Purchase Allowance 220-40ACA:10 Consumer Cash Program
- - $2,000 Take Retail Delivery By 8/31/20Select Market Bonus Cash 320-40AS:3 Buick Select Market Bonus Cash Program
- Sale Price $27,573
- You Save $7,841
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Not available with special financing, lease and some other offers.
3Not available with lease and some other offers. Residency restrictions apply.
New 2020 Buick Envision FWD 4dr Preferred
- Sale Price $27,573
- MSRP $35,415
See Important Disclosures Here
Specifications
- Exterior Espresso Metallic
- Engine 2.5L 4 cyl
- Interior N/A
- Location Bob Howard Buick GMC
- Model Code 4XR26
- MSRP $35,415
- Stock Number LD159339
- Transmission 6-Speed A/T
- VIN LRBFXBSA5LD159339
- Mileage 11
Current Offers
- MSRP $35,415
-
Price Reduction Below MSRP- $2,591Manufacturer's Incentive
-
$32,823Special Value Price120-40AX:1 GM Employee Pricing For Everyone Program
- - $3,250 Take Retail Delivery By 8/31/20Purchase Allowance 220-40ACA:10 Consumer Cash Program
- - $2,000 Take Retail Delivery By 8/31/20Select Market Bonus Cash 320-40AS:3 Buick Select Market Bonus Cash Program
- Sale Price $27,573
- You Save $7,841
Click here for more offer information
1Not available with special financing, lease and some other offers.
2Not available with special financing, lease and some other offers.
3Not available with lease and some other offers. Residency restrictions apply.
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* All advertised vehicles are subject to actual dealer availability. Certain vehicles listed may not be available, or may have different prices. Prices exclude state tax, license, document preparation fee, smog fee, and finance charges, if applicable. Vehicle option and pricing are subject to change. Pricing and availability varies by dealership. Please check with your dealer for more information. Prices do not include dealer charges, such as advertising, that can vary by manufacturer or region, or costs for selling, preparing, displaying or financing the vehicle. Images displayed may not be representative of the actual trim level of a vehicle. Colors shown are the most accurate representations available. However, due to the limitations of web and monitor color display, we cannot guarantee that the colors depicted will exactly match the color of the car. Information provided is believed accurate but all specifications, pricing, and availability must be confirmed in writing (directly) with the dealer to be binding. Neither the Dealer nor CDK Global is responsible for any inaccuracies contained herein and by using this application you the customer acknowledge the foregoing and accept such terms. *While every reasonable effort is made to ensure the accuracy of this information, we are not responsible for any errors or omissions contained on these pages. Please verify any information in question with Bob Howard Buick GMC.
Tax, title, license (unless itemized above) are extra. Not available with special finance, lease and some other offers.
New, Used & Certified Pre-Owned Buick GMC Oklahoma City OK
New & Used Buick GMC Cars & Trucks For Sale In Oklahoma City OK
New, Used, & Certified Pre-Owned Buick GMC Oklahoma City | Bob Howard Buick GMC