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Coolant in the oil means that
there is the potential for bearing, cylinder wall, and any
other lubricated parts to be damaged to extents that make
the engine not worth repairing.
How serious any damage is your
specific case is not determinable without a step-by-step
tear down while checking out specific parts for damage at
each step.
You indicate you experienced
occasional overheating and white exhaust smoke. These are
signs that the problem has occurred and needs to be remedied
immediately. Since the problem has existed over some engine
running time, it may have seriously damaged some critical
parts -- bearings, cylinder walls, and more.
The tear-down work should
proceed only if you have a mechanic and shop that you trust
and have had experience with.
They should take the project
one step at a time to check out the bearings and identify
the direct damage caused by the coolant leaking into the
cylinder(s). They should be capable of recognizing various
signs of damage that make the engine not repairable so that
they do not proceed too far and then -- too late -- realize
that it is not repairable.
You can look into replacing
the engine with a new crate engine from the manufacturer.
Also, you may locate a junk
yard that has a similar car with an potentially good used
engine that will replace yours. You will need a good
mechanic familiar with your Nissan engine to check out any
wrecked vehicle's engine before you purchase it for
installation in your car. |