What is the latest news on the 15W-50 Mobil oil? Last I read it was down on Zinc and not recommended for high performance marine engines anymore. I'm currently running Brad Penn 20W-50 semi-synthetic in a mildly upgraded 502 Mag. The Mobil is easier to come by, so just checking on the latest buzz.

I'm about ready to buy a case also, what the skinny on the mobile 1? or shoud I spread my cheeks for the amsoil, in canada it's $5 a quart vs 10 FOR AMSOIL

Here is one post on the subject

http://www.offshoreonly.com/forums/g...brication.html

Hello huys i use valvoline straigth 50w racing oil in my 502mpi is this oil going to hurt my engine? Thanks for the help.

Valvoline makes a good oil. I may be switching to their straight 50 race oil if I can't find the 20-50 Mobile 1 that I normally use. It's either that or Royal Purple for me.

The only name brand oil that I caution against is Casteroil. IMO its garbage.

Great....this is new news to me....I put Mobile 1 15/50 in my 600hp supercharged motors this year. Ran the engines hard for 1 hour. 4200 - 5500rpm.

Thanks I have been using it now for a few years and have had no problems and you can get it at just about any parts store thanks for the reply back.

VR racing series has more zddp I think.

I have been using Valvoline's Racing "Not Street Legal" oil

http://www.valvoline.com/products/co...ng-motor-oil/9

Not carried on shelf. I just have to special order it at Napa, they can normally have it at the store same day if i order in the morning. Cheaper than Amsoil.

You need to cozy up to a Amsoil dealer that only does it for friends and sells at dealer cost. PM me , I might know one