I had heard throught the grape vine that a local MB repair shop had a MB with ULSD IP leakage probs. So off I went to talk to the owner. Yep its true! Now this is not on the 617 engines, but the later models had the IP with the rubber O rings. He said that the new fuel is causing the O rings to start flaking apart like a biscuit or cresent roll. He was wrenching on these back in the early 90's when the last round of " desulfering" the fuel was happening and said that it will be a problem until the refiners solve the prob.
He was working on a '92 602 engine I believe.
I can wait
