PeterJ

Hi all joining this bandwagon as I’m having the same issue. Thought it was the oil return feed that needed the upgraded pipe with check valve but seems someone else here had it done and no joy. spoke to an indie who’s notorious among the bmw heads as one of the best around. He said it could be valve stem seals but the 40e isn’t known for the issue. That said, there aren’t enough hitting high mileage to know for sure. He mentioned the breather system could be having issues and leaking oil. I had a boroscope put into the heads to check and there’s definitely oil in the cylinders (also some scoring so not sure if this is related). There was also some oil around the spark plugs which again points to valve stem seals. Also worth checking the seals on the turbo but I had planned on getting this reconditioned as preventative maintenance. if anyone gets it resolved I’d appreciate if you shared what the solution is. No doubt there’s going to be more to follow in the coming years. There’s also an indie in abbyfeale, Limerick, Bavarian Autoteknik. The guy used to build engines for BMW in Germany for years. Supposed to know his stuff if anyone is around that direction he might be of help. i priced an engine swap and he’s quoting 8K supply and fit but hoping it won’t come to that.