Burning oil weirdness

[curlym3]

Hello everyone,

So I got a 96 M3 with a s50 intake conversion on a s52 block and head. I've had the car since last October and ever since I bought it, it has been burning oil and I always get a very strong exhaust smell of mostly burnt oil. I'm running stock headers, catless pipes and an AA exhaust and resonator. The only time I see blue smoke is when I come to a stop after the engine is warmed up and I've been driving for about 15 min. I come to a stop and if I tap the gas, I see smoke roll over my car. I've replace the VCG, the CCV, oil pan gasket, and oil filter housing gasket.

I'm almost at a loss with it so if anyone has had similar symptoms or might know what is going on that would be great. I have a feeling it is my valve stem seals but I don't get any smoke on startup and I don't think it is the piston rings because it doesn't smoke when it is moving.

Please help!

[tjm3]

Idle or decel and the throttle plate is closed with high vacuum in the intake behind the valve pulling in oil through the guides/seals. Made worse by warmer/thinner oil on warmup.

Under power the piston speed is high and the higher vacuum extends into the cylinder pulling oil through the rings.

I'm guessing guide/seal problems. Mileage? Guides and/or valves replaced? Most rebuilders don't replace the valves because the direct replacements are expensive or they use cheaper two piece valves instead.