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The only way you can get the oil from the crankcase is through the vapors. I must say that ANY modern engine takes the oil vapors from the crankcase into the intake, through the PCV system. Why 3.5DI is different ?

Fair question.

Look at it this way - Other then the air we breath, and moisture caused by the Venuri and J.T. affect, what's there? Oil vapors, that would normally get flushed away by fuel, could stay becasue it's a 'dry' intake manifold. It's the oil vapors that can the build-up, on the other side of the throttle butterfly.

It appears that under some driving conditions, carbon and oil stuff build-up during hiway driving. I'm told that city driving is best for the DI carbon issue.

That's their story, and they are sticking to it.

"Stubig" - '72 416.141 (U1100) Unimog
"Sassy" - '05 KLR650
"Brody" - '04 Rodeo (It's my wife's, really)
"Candy" - '02 TDI New Beetle (yes, a family of 4 fits inside)
"Twinkie" - '72 Revcon 250 (converting from Olds 455 to 6.5L Diesel)