I seem to be burning oil...not much ..but enough to be worried. there seems to be a bit of a leak from the tappet cover...if that helps in any way.....i raced a celica and he said when i dropped it back a gear i blew a heap of black smoke...and i didnt know whether to believe him or not...so i got my mates to follow me around and they said they didnt see anything...so i though the celica driver was haveing a go at me....but when i got home from work today....i was letting it cool down...and i gave it a little rev...and hopped out and waited...and i looked on the ground behind my car...and there is what appears to be like oil....smells like oil. gave it another rev and the same thing happened again......any ideas what could be the problem??? i orignialy thought turbo seals....and head gasket...any thoughts??