So I notice that I always get a cloud of light-greyish smoke when I rev the motor (under load - that is, the car is moving) to about 2500 rpm. This generally coincides with the transmission upshifting, but once my revs drop, the smoke vanishes too.

Should I suspect that my turbo is leaking? I can drive around sustained above 2500 rpm and I do not /think/ I see any smoke, but I need to definitively determine this.

Also - I never see smoke if I just rev in neutral.

Ideas?

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1984 300D Turbo, 326000 Km, Thistle Green Metallic

That sounds like normal soot, not oil smoke. If your turbo seals are bad you will have high oil consumption and lots of blue smoke.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

That's what I thought - just happens this is also my first Turbo (in addition to first diesel). I did just recently change my oil so I am tracking my consumption every time I fill. So far I've put about 350km on it and I might be down 1/4 of a litre.

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1984 300D Turbo, 326000 Km, Thistle Green Metallic

How about oil in the tailpipe?

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1982 300
1984 300cd
2005 GMC Yukon
1967 GTO Hardtop x 2
1967 GTO Conv.
2002 Harley Softail Classic