The second edition of an AMSOIL study of motorcycle oils has been released and — surprise, surprise — AMSOIL wins!
The report looks at motorcycle oil’s ability to maintain viscosity, resist shearing forces, minimize wear, and perform other necessary functions.
More than a dozen brands of oil were tested in SAE 40 and SAE 50 ratings, including Honda, Mobil, Valvoline, and Motul. AMSOIL did not win in every category, but in many cases the winner of one category faired considerably worse in another, while AMSOIL appears to have a good general performance across the board. Mobil’s oils finished in second place for both SAE groups, while Pennzoil’s motorcycle oil was dead last.
You might take the study with a grain of salt, but it makes interesting and perhaps informative reading. You can download a copy at www.amsoil.com.