Hi all, i'm about to purchase a used manual 2004 Acura TSX with 74,000 miles on it. I brought it to my mechanic and he said the car is good but the only thing he noted was that the engine sounded louder than normal, and i noticed this too. Could this be because the owner only changed the oil with synthetic oil every 7000 miles? (He's owned the car for 2 years and only drove 15,000 miles). It sounds a little like an older 4 cylinder economy car. But its not THAT bad, just curious.