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Does this only occuring when going down hill after a steep hill climb?
Let me know,thanks Pete
Since your not losing any oil or coolant with this issue here this sounds like a fault with one or more fuel injectors allowing to much fuel into the engine.This is an excess build up of fuel in the exhaust that is burning off causing the smoke issue after a steep climb.I have seen injectors act up like this here in the past before and had to replace the faulty injectors for this issue here.
If you have not had the fuel injectors tested at all to see if any are faulty this needs to be done as I suspect at least one is at fault needing replaced.
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Blue is usually oil but if you are not losing any oil excess fuel can cause this smoke.Usually fuel is black but light amounts of excess fuel can be blue especially with diesel fuel.
I would have the injectors tested for any issues and if found to be o.k. then it would be a good idea to have the engine valve seals tested to make sure it is not leaking any oil past the valves and being burned into the engine but this does sound like an injector issue here.
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I was thinking the same but usually if this is the case you would have engine running or stalling issues due to lack of the engine not being able to breathe/vent properly and the smoke would occur at all times.
It is very possible though.I dont show the components with this ventilation system.Usually you have a breather at the valve cover and possibly a valve at this breather that can clog.But it is a good idea to have the ventilation components checked and cleaned or any stuck valves replaced to be sure this isnt the cause here.
If you need anything else let me know.