Using rotella t4 btw.
Shell rotella t5 its valvetrain runs much smoother and quieter with a thicker diesel oil.
Valvoline VR1 for the track car. Valvoline VR-1 is a very highly reviewed oil with a high zinc content to keep race engines running with very minimal wear.
I believe the final takeaway was that Valvoline Max protection was the best
I only use Rotella T6 in all 6 of the cars at my house.
I just switched to Valvoline EP 0w20 after using Mobile 1 all my life, for a very important reason...
...the easy to open top with a built in pour spout. So good.
I've used Rotella T6 in literally all of my bikes since 2017 because it is cheap and has JASO MA2, it is deisel oil.
For this reason I run Valvoline 20W-50 VR1 which has high zinc and phosphorus to deal with the extra loads the flat-tappets put on the camshaft vs roller tappets.
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.
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