All that zinc / phosphorus stuff discussion is very interesting.
But what is so special regarding the 944 engine? If I understand things correctly, rodbearings etc. are generally nothing special and as well the 944 camshaft lobe operates a simple hydraulic
bucket tappet. So what, there are zillions of cars worldwide with bucket tappet operated valve trains on the roads. From New Zealand over Burundi to Alaska and many more countries.
I can't imagine that just our 944 engine should have a zinc / phosphorus stuff or oil problem.
Apart from that, below is an extract of the service manual of the 911GT3 RSR (2007 Model competition car), 3800cc/485hp and there Mobil1 0W-40 is recommended.
Ok, I'm aware that's no 944 engine.
