Buick GMC vehicles only. Excludes diesel and synthetic oil changes. Additional oil is extra. Tax, shop and disposal fees may be extra. Some models may be higher. Must present coupon at time of write up. Coupons are not stackable with other coupons. Coupons can not be redeemed for cash value. Offer valid at Bob Howard Buick GMC only. No refund on prior purchases. Some restrictions may apply. Call for details.