Re: 10w30 full synthetic or 10w40 non synthetic?

Posted by farmboy48 on February 01, 2015 at 09:03:21 from (208.107.15.166):

In Reply to: 10w30 full synthetic or 10w40 non synthetic? posted by Geo-TH,In on February 01, 2015 at 06:42:08:

My son about 10 years ago in high school did a science fair project, testing different 10-30 oils for heat breakdown, flowability at -30 degrees, and friction resistance after it had been heated (boiled) for 20 minutes and at room temperature. He used 12 or 15 different brands of oil both synthetic and regular. The Amsoil 10-30 came out on top in all tests. If I remember right, Pennzoil 10-30 was second. He took 3rd place in the state science fair in Fargo.

Dick ND

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