Message text written by "andrew cluver"
>The only way to determine if the oil is the reason for low flow to the
rockers would be to drain the engine and fill up the engine with another
type of oil. Maybe try this with 5 different types/manufacturer's of the
Unfortunately, it ain't quite that simple. What you would have to do is
get five engines and run each for about 100,000 miles with a different type
of oil and see which oil leads to long term accumulation of sludge. A test
beyond the means and attention span of any one on this list, I would think.
Most folks here use either Castrol or synthetics anyway, I'll bet.
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