This. ALL shops are more likely to go out of their way for a loyal customer, and it sounds like you are. If you were the guy that did roll in there with the jiffy lube sticker that's 1500 miles overdue, with little to no history with them, AND you come in with a demanding tone, good luck with getting anything more than the minimum level of customer service. I would hope that the techs are smart enough to do the best job they can regardless of the customer.