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- May 26, 2001
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........... Also what is the life span of the Mobil 1 sitting in an engine and started every once in a while---should he change it out after 6 months even if the mileage never gets close to 3k?
A characteristic about synthetic oils that is seldom ever mentioned is that after a few days they have drained off the cylinder walls and bearings.
So if the vehicle sits for a week or more, it is more susceptible to a "dry start" than conventional oils. So logic would be that for a low mileage car, like my 9K mile one, use regular oil as the long-life protection of a synthetic is of no benefit and could be detrimental.
Of course using an EP additive would probably negate the drain-down problem, but still be a waste of $$$ over regular oil doing the same job.:smile: