I would only use dealer or do it myself... A close friend or family member is ok too...
Only thing with getting the dealer to do it is that they have the records online. Maintenance issues for warranty work aren't an issue, all Acura has to do is look it up. This helped a friend with his P.O.S. Dodge that blew a tranny. However, if you keep your receipts warranty work CANNOT be denied BECAUSE you did not use Acura for service per Federal Law....
If you HAVE to use a ten-minute oil change place, best advice is to WATCH THEM DO THE WORK... Inspect the car afterwards, that way if they stripped the plug, etc.. you can get it taken care of at that time and there is no room for "We didn't do it, the last guy must've"
As for an older car, Why would you put an older car through hell but not your new one. I treat my old 1988 Mustang the same way I do my 'x. Synthetic Oil, the best oil filter I can find, and K&N filter...