04-22-2009, 08:21 AM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
Posts: 3,077
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Not Ranked
Yes, because
#1) huge viscostiy range which requires a larger volumen of modifiers
#2) Viscosity to heavy, does not lubricate as well when cold, does not disaapate the heat as quickly when hot.
Roush recommend 10W30 in their $15K engines, good enough for me
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