The following competitor product comparison tests were performed comparing Amsoil Synthetic Extended Life XL 10W-30 motor oil (XLT) with Castrol Syntec, Valvoline SynPower and Pennzoil Synthetic 10W-30 motor oils. The tests performed were Noack Volatility test, Four Ball Wear test and TBN test. You can view the test results below.
Noack Volatility Test Graph
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