Posted by docmirror on May 21, 2018 at 08:21:25 from (107.213.165.255):
In Reply to: Briggs Stratton oil posted by Ih10020 on May 20, 2018 at 19:15:06:
The good folks at Lycoming and Continental engines have done tons of research on air-cooled oil needs for many decades. Although some viscosity modifiers are ok in an air-cooled engine, there are plenty that are not good. They will eventually cause a shear-point breakdown due to overheat, and loss of effective lubrication.
Mobil Oil found this out the hard way when they introduce their 15W-40 aviation Mobil-1 oil product, and suffered several in-flight engine failures caused by oil failure. Several people died before Mobil withdrew it from the market, and the FAA banned it from use. Mobil also bought hundreds of aircraft engines which they damaged with the Mobil-1 product
It's not the base oil that is the issue, it's the additive package. The long chain molecules of the modifiers are not lubricants, but they have a temp coef that lends them well to altering the viscosity when cold. But - too hot is always a problem. What is saving the oil companies now is that the modern SG and SL oils are so much better than the first gen multivis oils. Also, the base stock dino oil is much superior to the stuff that was hydrocracked just 15-20 years ago.
Better base stocks, better type, and molecular bonding have made modern multi-vis oils safe for many air-cooled engines. Doesn't mean they are better for air cooled, just that they are so good, the flaws are not as noticeable.
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