Only At Alfred Matthews GMC, Buick, Cadillac. Buy 3 lube, oil, and Filter changes for $99.98 and received the 4th one at no charge. Included with this incredible offer is a Complimentary GM Goodwrench multi point inspection and a vital fluid analysis. This offer is only available through the Internet. To take advantage of this offer click on the Schedule Appointment button and fill in the Required Fields.  Put the coupon code in the additional comments box. Your coupon code is 1936.