Let me know how that works out. I have been running Brad Penn 20w50 for a few years now in my 3250 SS with stock power and start to notice deterioration after about 10hrs, but much less than with Merc oil

Drock They have a great marketing scheme along with many other Lubricants (not to bad mouth them by name) but I have been in this HP motor game since 1972 and most of the claims are just marketing hype. Buyer beware!!

thanks for posting this joe,now i have a headache trying to figure out what oil i am going to use.

Last year I went on a Royal Purple kick . In a relatively short amount of time my boat , truck and motorcycle all started to use some oil no doubt because of thermal breakdown . Disappointing for the premium price for a supposed premium oil . I just ordered 20w50 Dominator Race Oil for the boat and 20w40 for the bike . Anxious to see how the Amsoil will hold up . Seems many guys here like it ! Mild , I did not see Amsoil Dominator in your comparison .

Yeah no kidding Mild Blunder, why is it 10w30 has more tensile strength in most cases than the heavier oil, ... Lucas 10w30 racing has a ton of zinc/detergent and great strength wtf

I had a comp cam that I installed in a conventional 454 single center cam....along with top end upgrades....

About a week into it, I got a cyl 3 flat spot....Intake (so noticeable stumble)

Removed...returned.....summit sent a second cam and I returned the first...

Reinstalled......all good.....for about three weeks....stumble again....

Called summit again. They refused the claim because I told them I was using full synthetic....and that the instructions clearly stated no synthetic.."

Did I get hosed, or is fullsyn too slick for conventional (non ohc) motors?

I posted in general discussion "what oil does Mercury recommend for their 1350" I guess all they run is Mercury 25-40 blend. I used to use Mobil 1 20-50 (never had a lubrication problem) when availability went away I switched to Brad Penn. But I think I'm seeing a drop in oil pressure when hot that I never had before?
If Mercury 25-40 is good enough for their 1350 should be fine for my 1150's??

One of these??

http://www.mercurymarine.com/parts-a...nd-mercruiser/

or

http://www.mercurymarine.com/parts-a.../blend-verado/

For the record, I promise to take Joe out to dinner this week and buy him enough Kettle One that will stop him from posting as if he has no hobbies nor friends. As it was informational, it is still totally inappropriate for a Friday!! Joe, you are acting like it is cold and flooding or something, get a grip on it will ya!!! Lol

For the record, I always used 20w 50 per my mechanic and had 400+ hours per boat and never a motor problem, snowmobiles were a different discussion, who knew you couldn't tape it wide open for 20 miles??

I wonder where Amsoil Dominator falls?

Why in the boating scenario would a straight grade say 40 weight not be a better choice thasn the multi viscosity? Im thinking I may try it and see how it performs. I have always run the VR-1 Valvoline dino but usually in the 20-50 weight.