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Great info guys. I knew you'd come through!
Mark, my Grizzly was bought used and its probably always seen dino oil. I just us it on the farm so I don't think I need synthetic even if it wont leak. It is dry now so I won't risk it. I use syn oil when I feel it won't lead to seal issues. With a feet of over a dozen vehicles to maintain the syn oil lets me forget an oil change for a while.
I do like the rotella. Use it for winter 911 storage and in my diesel F250.
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