Although it could be the valve guides (particularly the start-up
smoke). Smoke from valve seals when running usually isn't a big
problem with turbocharged diesels. I'd suspect the turbocharger as the
main culprit. Another possibility would be an engine with a lot of
sludge. The sludge blocks the drain path from the heads back tot eh
oil pan. This leaves a lot of oil in the heads around the vale stems -
and encourages leakage into the intake track.
If I wanted a decent answer, I'd ask for Jim Warman's advise. He
actually works on Ford diesels.
I had a '84 Ford Escort with worn rings & guides. Tried to gain additional
mileage on the tired engine by adding some "no smoke" oil additive. Problem
is it thickened up the oil a little too much & I blew the cam seal right out of
block & set the engine on fire. Had lots of smoke then.
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