Castrol gtx 10w-30 novack

In a recent amsoil catalog I noticed a graph that compared conventional oil to amsoil 10w-30 full synthetic motor oil. The best showing conventional was castrol gtx 10w-30 with something like 7 or 8. That is very good when some otc synthetics can't score that well.
 
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Originally posted by like a rock: In a recent amsoil catalog I noticed a graph that compared conventional oil to amsoil 10w-30 full synthetic motor oil. The best showing conventional was castrol gtx 10w-30 with something like 7 or 8. That is very good when some otc synthetics can't score that well.
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