Most likely a classic example of not understanding statistics. Most Subaru WRXs that have spun bearing were probably using Mobil 1 because Mobil 1 is probably used in more Subaru WRXs than any other oil. A reputable reference with real data to support your claim would be nice otherwise it is just conjecture.
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Originally Posted by Malsua
Ask all the Subaru WRX guys who spun a main bearing if they are surprised that Mobil One performed poorly.
Amsoil _IS_ the best overall synthetic oil.
That said, unless you're really pushing an engine very hard, any synthetic oil is just fine.
As to golf carts and other splash lubricated engines, regular oil often performs better because the oil is stickier rather than slippery. It sticks to friction surfaces rather than "sheeting".
In engines with an oil pump synthetic is better generally except in some cases on propane fueled engines. Synthetics can cause coking when in the presence of the blowby products from propane combustion. In those cases, you should run an oil specifically designed for propane engines.
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