David,
Your logic is, for the most part, incorrect. My following comments are
based on a dialog I had, many years ago, with a Chevrolet fuel induction
engineer who played a key role in the development of the Turbocharged
Corvair in the mid 60s:
You are absolutely correct in your specifying synthetic oil for the turbo
charged engine. The reason is that the turbocharger (as opposed to an
engine driven supercharger) is mounted on the exhaust manifold (one of the
hottest parst of the engine). Engine oil circulates through the turbocharger
bearings (mounted on the exhaust manifold). This acts like a "flash oil
cooker." Synthetic oil can take the heat much better than mineral oils, so
it maintains its lubricating qualities (as opposed to circulating "cooked"
and compromised mineral oil through the engine).
Stresses on the engine are another matter, and the reality is
couterintuitive. The biggest load and stress on a piston engine is caused,
not by turbo boost, but by elevated RPM. The faster the enging turns, the
faster the reciprocating parts have to move, start and stop.
With a turbocharger, the engine produces more power at LOWER RPMs, compared
to a conventionally aspirated engine producing comparable power. Therefore,
if the driver does not over rev the engine, the turbo charged one will
actually last longer. Modern, computer electronic engine management systems
can also keep the engine running in a low stress manner.
Oliver Filippi
[Non-text portions of this message have been removed]
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