On Mon, 13 Oct 2003 12:57:22 -0600, el lobo wrote:
One of the primary concerns with switching from dinosaur to synthetic in
higher mileage engines is that the syn will often times do a better job
of breaking up and suspending sludge buildup. On well seasoned motors,
seals (ie, rear main, valvecover, oil pan) are often pretty much shot and
only seal due to the buildup of debris behind them. Disturbing this
debris will sometimes open up a leak path. Also of some concern is what
the sudden circulation of 100k miles worth of crud can do to bearings.
The change of the oil itself, however, poses no danger. If the engine
has been treated to faithful and regular conventional oil/filter changes with
quality products and sludging is minimal, the danger is pretty small.
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