Been running vr1 straight 50 since I bought the boat. 12qrts comes out to almost a100$ every time I change the oil. I heard rotella has a lot of zinc in it. I have a flat tappett cam so I need the high zinc content. Would I be alright running say 20w50 or somethin? Or is it worth the extra money for the vr1. Motor is a 455.
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Are you looking to start a 300 post thread on oil?
If you want my answer, you will have to do the research to disqualify the information.
Rotella, Delo and all other DOT oils are and have been going through the same changes as regular passenger car motor oils. So what works now may not work later.
All that being said. I have run regular Kendall 20-50 with a little Camshield break in additive. Makes it a $35 oil change.
The one caution is, know what the heck you are shooting for as far as ZDDP content.
You have to research the ZDDP levels in the oils used and add just enough zinc to fortify what you have.
You really do not want to exceed 1,600 ppm (.16%) total.
GT