I have a 1994 F-150, and bozos at work all tell me I have a different kind of engine, cause they wanna sound smart, but they're all bullshitters, so I can't tell. is there a way to distinguish between the C, W, or M? I'm pretty sure it's not an M, cause that's old school, but if anyone would gimmie a hint on how to tell the difference, that would be awesome. Help a brother out...