Routine maintenace on all of the stuff around here is something I enjoy doing. Not that I don't have faith a dealer (tractor, car, boat, etc.) but sometimes it seems that the details are overlooked.
For example, I took the vehicle to a local dealer for a recall issue (Crown Victoria, possible gas tank explosion warning). I thought since it was there, why not get an oil change? Just for shi*'s and giggles, I used a permanent black marker and made a few distinguishing marks on the oil filter. I picked it up, paid for the service and before I drove off, looked under the hood.
Guess what? Same oil filter. I showed the service manager, explained to him what I did and after a brief "investigation" he stated that the "mechanic" admitted to changing the oil but "forgot" to change the filter. I won't bore you guys with the aftermath of the situation, but this is one reason that I do my own services. It's a must to keep good documentation and reciepts for oil, filters, etc. Especially if things are under warranty.
BTW, a few friends and family have managed to get a new oil pan from some of these "jiffy-quick, super-duper" lube places. The pan plug gets cross threaded and the guy keeps cranking it down as he looks to see all of the cars line up behind him.