Wolf's head 30wt,, It'll never let you down...

Just kidding. You can pretty much any of the major brands, just change it frequently what ever you use.

What ever you go with, make sure you change it every 15 minutes........

I'll agree with others....Rotella 15w-40

Mobil 1 V Twin

15W50 Amsoil Dominator I couldn't stand it , just had to put it out there . Change once every two or three summers......

I have run Rotella in every thing I owne. Lawn mower, cars, tractors, motorcycles. But, never in a boat. How would it do in 525's???

what's the deal with rotella? the diesel oil?

the diesel additive package helps with engine load. spark (S) rated oils contain less ZDDP additives compared to performance/racing or compression( C) rated oils.

Nothing major. It's a good oil, hold's oil psi very well, and is cheap.

Note: they where the last hold out of street oils containing ZDDP, but, they had to succumb a few yrs ago. So, if you have a flat tappet cam, you'll need to go with 'offroad' oils that do contain it.

Back in the day -- when we had 9 planets-- my dad started using Rotella. NEVER had one oil related issue. I've used it in my diesel cars with no problems -- it is a very good oil

3pointstar

is the zddp the zinc? doesn't valvoline 20/50 racing still have zinc in it? btw, good info, i wish all forums were this simple and non polluted