I've been running rotella t6 4w40 in my 81 cb750c for the past 15 years. I also use it in every other bike I own or have serviced and my 4 wheeled vehicles.
I use Rotella T6 5w40 in all my vehiciles. It's a quality oil that works well for everything I own from mechanical turbo diesel to motorcycles to big blocks.
Amsoil in everything I ever owned. My 2017 RAV4 hybrid is sitting on 350k miles and still running strong.
I run amsoil in the engine and primary and redline in the tranny. No issues, my glide runs better on the amsoil then when I the syn3 in it
Here I am just dumping in Amsoil 5W-50 SSO because all I care about is shear wear protection and something content with high temp operation. 20,000 miles and not even a single psi drop in compression the whole time, don't even premix.
something you might consider is switching to Shell Rotella T6 5w-40.
you can find many testimonies to the benefits of using T6.
I've been using AMSoil 5W30 in my WRX since it was new (2003). Turbo is still good, and head gaskets lasted 17 years. I think it's worth the price.
I use Amsoil 0W20 but I’m a dealer. I have access to the test they run comparing it to Mobil and AC Delco stuff. The Amsoil is supposed to be better longer, but to me that comes down to your filter more than your oil.
Amsoil allegedly is the best. I use it in everything and no issues so far.
My 1.8t is currently filled with Rotella T6 and I swear its eating less oil now (or maybe I'm getting better with my heavy foot)
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