Re: Another oil question....

Posted by Hermit on June 11, 2005 at 17:21:16 from (69.21.48.94):

In Reply to: Another oil question.... posted by Stan(PA) on June 11, 2005 at 11:03:31:

It has to do with the interpretation of the numbers. The numbers 15W-40 of a multi-weight oil don't represent the actual oil viscosity but the SAE viscosity index numbers. The 15W-40 oil conforms to the viscosity specs of a 15W grade oil at 0 deg F (the "W" standing for winter) and a 40 grade oil at 210 deg F. As for the actual kinematic viscosity of 15W-40 oil (measured in centistokes), the oil at 0 deg F is 5000 centistokes and at 210 deg F is 14 centistokes. In other words, all oils thin out as they heat up and the SAE index numbers of a multi-weight oil just tell you how they appear to act when cold or when hot.

Follow Ups:

• Re: Another oil question.... Stan(PA) 18:44:56 06/11/05 (1)
  • Re: Another oil question.... Hermit 05:40:50 06/12/05 (0)

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