Once the engine is warm & say you stop at the lights withe the blowers on I can smell oil coming through them.. Theres no trace of an oil leak on the floor nor can I any excess oil in the engine bay. Is there a common seal / gasket that fails on the engine. It's a MY95 WRX.

Cheers

 

Get under your car as it will either be one of your cam shaft oil seals, 1 on either side of your engine or your crank shaft oil seal which is in the middle as you look at it,which ever its is it will be dripping onto your exhaust headers (Manifold) as they run underneath your engine and cause the smell.

Zippy

 

Sounds like the drivers (turbo) side rocker cover gasket to me!!

 

Same symptoms as mine - was the Drivers side rocker cover gasket dripping onto exhaust! Bl***y annoying smell but fortunately not bad enough to put up smoke at junctions etc.