Which way do you think saves the most money? Of course, most would say Diy, but then again, shops know this and might provide excellent deals to keep you coming back. For instance, at Jiffy Lube, they change your oil for a decent amount of money. In fact, it might even run up to 100 USD. Nonetheless, though, they will also do free maintenance between oil changes. However, on the other side, companies like AutoZone make a massive profit from people who fix things themselves, and of course, they would be putting out excellent deals.