if it puffs smoke, on start up, I would say valve guides, especially if its clear once warm, turbo seals are normally steel rings, I don't think you will loose much oil pressure, if they are worn, and if broken you will tell by, remove the exhaust side off the turbo, and see if its wet, oily,
oil pressure drop could just be that oil is breaking down, any leaks.
smokes all the time ? or cold, and start up.
unburnt diesel, will have nothing to do with oil,
perhaps an injector isn't atomizing fuel correctly, check that the engine oil isn't getting fuel in it, and getting thin, this would cause a drop in oil pressure as well, pull the dip stick and see if it smells like diesel, the exhaust will smell rich as well, but unless your a mechanic you might not know what I mean.
is the engine oil level coming up, fuel in oil.
whats it in and how old,
what engine, 4 cyd Toyota diesel, correct, what generation, year.
common rail for fuel system, or good old rotary pump, and capsule injector's.
I haven't worked on them much, but have a work mate, here who, buys old Toyota hi-lux's, and fixes them and resells them.
Last edited by southernman; 03-19-2016 at 12:17 PM.
Reason: add info.
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