Quote:
Originally Posted by CB762
Will it make much difference (for hot track days) to run 10W-30 instead of 5W-30? I don't know much about engines.
TIA.
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The first number is your cold start viscosity. When both of those oils come up to operating temps they are a 30 weight.
As was mentioned earlier the lower cold start weight oil might have a slight compromise at the higher end of it's usable temperature range, but you probably won't notice the difference.