These are great suggestions and I'm not financially ready for my mechanic to pull the head. I want to try to run B50% or higher to see if that will clean it out however my is convinced that there is some type of physical damage to the upper engine or possibly the piston/ rings. Therefore he must pull the head. He was not too keen on my conservative approach to the situation. If I run a few tanks of biodiesel,I'm worried that if the is physical damage already present, won't driving the car further damage it?
Damn I really wish there was someway of knowing for sure, physical damage without needing to pull off the engine head!

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Frankie
It never ends!
1985 300D Turbo 181K Anthracite grey, "SOPHIA"
1984 300 SD Turbo(sold)
2004 Subaru Forester XT,Cayenne red.