So, I recently took my car in for what was supposed to be a “full engine service,” but I honestly didn’t know what that actually meant. The mechanic replaced the oil, checked the filters, and ran a few tests, but it all felt kind of basic. I always thought a full service was more detailed — like checking belts, spark plugs, or cleaning the fuel system. I drive a lot, so I want to make sure I’m not skipping anything important. How often do you guys take your cars in for a full engine service, and what do they usually include?