I just got my oil changed at the local JL. The guys there said they checked the air filter and it looked ok, so they just turned it around and put it back in. It didn't hit me at the time, but this doesn't sound like a good thing to do. Now the dirty side is exposed to the engine, and dirt that was stuck in the filter will be sucked into the engine
Should I just flip it back? Or is this acceptable practice to flip an air filter around?