Reply to "351C lubrication system & lubricants"

rockyMember

quote:
For example, 0W30 flows WAY better cold than 20W50. And 0W30 flows WAY better cold than straight 30wt, which is horrible for cold start-up flow and should be avoided at all cost. And the lower the second number hot viscosity rating, the better the hot flow. For example, 0W30 flows WAY better hot than 20W50."

My 6th grade daughter just did a Science Fair Project evaluating the viscosity of oils over temperature, and the data matches the comments above. Her data and methods are posted here for your reference.

Rocky

Test Setup #1 (I helped invent the "Viscometer")

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