Originally Posted by hrcollinsjr
Keith,
Why not go all the way? Mobil offers 0w20, 0w30,0w40. I wrote a letter to Castrol years ago inquiring about different viscosities possibly voiding the warranty on my then new Dodge Caravan. Their response was that as long as it met the API/SAE standards it wouldn't void the warranty.
Harold
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The "0W" refers to the low temperature viscosity, which would help low temperature cranking drag, but not "running" drag, so a 0W20 provides the same running drag as the 5W20. Some "experts" suggest that the wider viscosity ranges created by viscosity enhancers can be helpful during wide ranges of operating temperatures, but create a lower-durability oil, prone to more rapid breakdown. There's no free lunch