Originally Posted by gsxr

The problem is, the only oil supply passage to the OM60x cylinder head is in front of the #1 cylinder. That was my point... there is not an oil passage by the other cylinders to allow oil to be squirted in there.

There is also not a large amount of oil sprayed on the valve stems, the primary oil feed is to the hydraulic lifters. Again, if there was a ton of oil dumping down the valve stem only on one cylinder, it should be very obvious looking into the ports on the head. That cylinder would have very wet oily valves and the other cylinders would not (or would at least be visibly different).

I also don't think that oil would come from the turbo into the cylinders during a compression test. While the engine is running, sure, that's possible. But cranking from the starter? How would that much oil blow vertically up & over from the turbo to the intake, and then backwards towards the head, at low RPM with the turbo impeller barely moving?

I still want to know the piston protrusion data...