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Originally Posted by sperry
I would bump up to the 15w50. The heavier weight oil will protect the motor better in the higher temps and additional load, at the cost of horsepower.
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This is what I'm wondering... Is the above statement true? As I understand, oil has two functions:
1. To remove/distribute heat
2. To provide at least a 1 oil molecule seperation between moving metal parts.
OK, and 3 is to carry debris of combustion/wear to the filter.
With today's engines, is heavier oil ever better at 1 or 2?
I would think higher viscosity may offer higher pressures, but at the cost of flow volume. I would think increased flow would offer better 1 & 2...
I guess the question is if thinner oil can do #2 as well? As long as the temperatiures are not such that the oil is breaking down, again, I would think thnner is better to a point.
If I recall correctly I've been using blue cap 5-30 Mobil one.