We recently had a new Chevy dealership open a few miles from work. Their management team decided to send an oil change coupon for $9.95 out to all the local businesses. The coupon has no expiration date, encourages people to duplicate it and it doesn't have a clause that excludes diesel's!!!! So I called them up and asked if they could get the 81 300SD in today and they said no problem. The service writer said they loose an average of $3 per car with the coupon. My total bill came up to $84.15 and with the coupon I paid a whopping $11.26!!! What a huge mistake......I bet they think twice before putting out any more coupons( or at least proof read them better)!!! Oh, they used Delvac and a Napa filter.