To Further Confuse--2 Conflicting Expert Perspectives - Saab 9-5 Bulletin Board - Saabnet.com
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To Further Confuse--2 Conflicting Expert Perspectives
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Posted by Questtt3 [Email] (more from Questtt3) on Thu, 19 Jul 2012 22:43:29 Share Post by Email
In Reply to: 2001 9-5V6-3000 Mile Family Trip--Oil Weight Change?!!?, Questtt3, Thu, 19 Jul 2012 21:50:44
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I came across an Amsoil page that discussed a number of FAQs, one of them being 30 or 40 weight multigrade oils. It is an interesting read and does a great job summarizing what I discussed above. (I tried providing a link but got a warning message from this site not to link so included the final summarizing statement:

". . . In fact, many national racing teams use the 0W-30 (as well as AMSOIL Series 2000 20W-50 Racing Oil). The extra horsepower and friction reduction from the 0W-30 often assists a race driver in attaining superior performance.. . . This leads to the next topic: many people also ask us if the 0W-30 is too thin a viscosity oil for high ambient temperature operation. The answer is absolutely not! Thicker viscosity oils are not always necessarily better since in addition to its' various engine lubrication functions, an oil must also effectively transfer heat. Only about 60% of an engines cooling is performed by the engine coolant, and only on the upper half of the engine. The remaining 40% of an engines cooling is performed mainly by the engine oil.

Although a vehicle that is recommended to use a 30 weight oil can also use a 40 weight oil, it is usually not needed. You will gain absolutely no benefit from using a thicker viscosity oil if it is not needed. The only time we recommend a 40 weight oil, such as AMSOIL's 10W-40, to a customer in a passenger car or light truck application is if the vehicle's engine is excessively worn and consumes oil at a higher than normal rate or if the vehicle is being used for very severe duty, high load, high temperature applications."

Another forum site, however, in great length discussed the greater oil pressure benefits from running a 40 or greater weight oil. (Again, I included a link in previous post but was warned not to and my post was canceled).

Who is right as far as the better weight oil to run, especially taking into consideration warm temperatures (if this is relevant)? Thank you!

posted by 74.105.167...

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