Any idea guys? I don't want to start replacing and/or doing job without identifying the cause.

Should I be seeing blowby from the crankcase vent tube? I mean it is an enging with 480k km (300k miles).

Can the valve seals be changed without removing the head?

Thanks

Deni

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1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.