this must be the psi of boost. not the compression. compression should be around 125psi. or maybe you were refering to the compression ratio which would be 8.5:1 or 9:1.

I tried to find my owners manual that was in english, however no luck. I have like 5 German manuals lol. But I do remember the english one saying something about the cosworth using oil. if I find it I will post it up here.

TF