20w50 synthetic turns out to be about a 10w40 of regular oil... The synthectic is way better for protection.. I use Royal Purple 20W50 synthectic... Royal purple is the latest oil out there that I seem to have seen a quiter running motor. With 60K now its quiet as can be. The oil is accually purple. looks cools about 5 bucks a bottle... They make a racing application oil for High HP motors which is a little more expensive, A buddy uses it in his LS1 and it looks great with plenty of oil pressure.
My saab turbo 16v had 140K
My 900s 16v had 216K
My 900 8valve had 240K
all with 5spds.. the turbo would give some of these 5.0L's a run for the money.
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