Originally Posted by Dan Rotigel

Not sure how the check valve operates, so don't want to go out on a limb with a diagnosis, but I could imagine debris in the oil pan causing such a situation. If something is clogging the pipe so it only reads 2bar, with more small stuff that can get sucked into the screen when you rev the engine (thereby increasing sucktion at the intake, but blocking pressure after the pump), you could end up with a screen that blocks more and more oil as the revolutions of your engine increases.

The check valve is on the timing chain cover on the drivers side-low i think. If you don't have a manual-get one, or rather, get as many as you can, many times they overlap.

My 2-bits say you have pieces of guide-rail that broke off after getting *****-slapped by the chain for too many miles. Dropping the pan isn't terrible, and it will let you check for pieces. If you find pieces though, you might want to pull the engine and do the rail-replacement with it out of the car.





cheers,
dan