There is no substitute.
My friend was riding behind me on the highway and he noticed blue smoke coming out of my exhaust when i hit the gas... I tried revving it from it being parked and nothing came out. My brother followed me down my hill and no exhaust fumes came out but at the bottom of the hill where it goes back up i punched it and he said a big puff of blue smoke came out. What do you think this could be? I'm guessing the puff came after it went from 2nd or third riding down the hill to me punching it and it prolly went into 1st. I drive an auto with about 103k. Just got my oil changed about 300 mies ago or less. Car feels like its running strong with no problems and no engine light is on. any other info ide be happy to provide. plz help me out.