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Try running it with the air filter cover removed. That way crankcase fumes cannot get in to the inlet. Also try running with disconnected EGR & intercooler hoses. That way you can eliminate turbo seals leaking. Basically your dividing the inlet path into sections to eliminate possible causes.
Outside air >> Air filter >> MAF+IAT >> Turbo >> Intercooler >> EGR >> Inlet Manifold >> Cylinders.
Three places for oil to get in: Crank Breather, Turbo, EGR.
We went through the same stuff, so after cleaning the intercooler & pipework, plus a new crankcase breather, we confirmed no smoke from the turbo (therefore seals ok). It ultimately became obvious our issue was probably worn or leaky injector insides.
Outside air >> Air filter >> MAF+IAT >> Turbo >> Intercooler >> EGR >> Inlet Manifold >> Cylinders.
Three places for oil to get in: Crank Breather, Turbo, EGR.
We went through the same stuff, so after cleaning the intercooler & pipework, plus a new crankcase breather, we confirmed no smoke from the turbo (therefore seals ok). It ultimately became obvious our issue was probably worn or leaky injector insides.
