Why, why why? Didn't GM offer a Mr. Goodwrench 30 minute Oil change at one time. If it wasn't for the fact that this Service was FREE I would have gone to Montgomery Wards:dazed002:. At 14 thousand miles I got the 15K Service from my dealer (been getting those Interval services all my life and couldn't believe what the Dealer sold me for $129.95, total ripoff.) Needless to say that is why this one was on the house! I was treated with great respect as a valued customer, in fact my GM Dealer has always exceeded my expectations, well until that last time. I avoided speaking to any sales people or sitting in a showroom car this time as salesmen will flock to you if you do. Also got a Haircut!