I think it's related so I'll post it...
Some of the better oil change shops (the only one in my town just happens to be good) will also check your trans fluid, rear diff, grease any/everything with a fitting, top off everything that needs it, and if you bring your own stuff they will use it and not charge for whatever you bring *so with oil/filter all of that costs me about $10 or so*
To me, $10 isn't worth having to jack the car up (one side at a time, of course) put jack stands under it, empty out an oil drain pan, get oil on the floor, put down 5# of kitty litter stuff, find a wrench, get under the car and lay on the cold concrete, break the drain plug loose (and risk busting knuckles on something) waiting under the car for the oil to finish draining, putting the plug back in, getting out from under the car, cleaning my hands, popping the hood, trying to break the oil filter loose, *sometimes with a hot exhaust* Trying to keep as much oil as I can in the filter so I don't get oil everywhere, Lubing the new filter, "filling" it up, getting it tight, putting the new oil in making sure not to spill any down the side of the block, getting it full, checking it, close the hood, starting the car, checking for leaks, jacking the car back up (1 side at a time), removing the stands, backing the car out, cleaning the floor, and deciding whether or not to get rid of the used oil now..... or hope someone else does it. Oh, and worry about getting my hands dirty the whole time because the girls uin my class won't STFU when my hands are dirty, it's annoying as hell.
Not worth it, IMO, if you can get someone you know and trust to do it for $10 and check/grease anything that needs it...