> Buying the oil, filters and all the tools you need to do it forever would cost less than one oil change at the dealership.

Are you changing your own oil? The cost of oil alone usually ends up being around 3 DIY changes vs one at the dealer ship. The mobile 1 synthetic I like is currently $92 for a 3-pack of 5qt containers. Which is enough for 3 oil changes with some left over to almost do a 4th. Dealership currently wants $84+tax for change w/free tire rotation. It's cheaper but certainly not "do it forever", and living in an apartment often means risking getting a warning from the landlord for doing auto maintenance in the parking lot since its against the stated rules in the lease.