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That’s a great question. Why isn’t AMSOIL API certified? Amsoil exceeds API requirements and it’s not necessary to spend hundreds of thousands of dollars to get that seal on your bottle. Actually, Amsoil produced the first API certified synthetic engine oil in the early 1970‘s. The first “can” of oil was a 25,000 mile 10W-40 synthetic motor oil that was available on the market in 1972, Amsoil was the first Company to introduce the 35,000 mile synthetic motor oil and 25,000 mile synthetic Absolute Efficiency Nano-fiber oil filters. Amsoil’s Nano-fiber filters are 98% efficient at 15 microns and 50% efficient at 7 microns. Put it like this, Amsoil covers your warranty because it already meets the API requirements. "Will AMSOIL Motor Oils void the warranty of a new vehicle? Absolutely not! Manufacturers’ warranties are based upon the use of oils meeting specific API Service Classifications, for example, SJ/CF. (AMSOIL lubricants meet the current API Service requirements and, thus, are perfectly suited for use in any new vehicle without affecting the validity of the new vehicle warranty.)" Remember, poor quality oil such as Pennzoil is API approved, that doesn’t say much does it?
"Amsoil is the Best Lubricant made, the Standard to which all others are judged." Bobby Unser three time Indy 500 Winner, 35 overall Indy Car wins, & 13 time Pikes Peak Hill Climb Winner
Your answer to my question does not answer the question. I hate to be the doubter, but until and unless empiricall evidence from an independent lab showing how Amsoil conforms to the industry standard that is used to judge all lubricants is revealed, I will not be convinced.
Anecdotal evidence ("I drove a million miles in my Peterbuit going up Pikes Peak backward, etc", or possible paid endorsements like a racing driver are evidence of nothing. They put STP stickers on race cars, for example. It does nothing, but you can get an endorsement from the driver.