dozer

So I take it that no one has heard that in some cases you would have to run a light oil because of the lifters? I thought it was strange when I was told this.

4bus

iTrader: (4)

Never heard of it. Most of us on here also run roller lifters, and do not run 5-30.

Scroll up and answer the questions from rmbuilder and mild thunder asked, these guys are respected builders and can't help you without that info.

Oil is not your problem, you have mechanical issues that are only going to get worse over time.

CNC

Ok I have asked on many oil threads..but never got a answer. What oil does Mercury recommend (or use) in their race motors,1150's, 1350's and now 1650's?

MILD THUNDER

iTrader: (3)

Morel doesn't recommend a oil thicker than 5w40 for their high rpm race series lifters.

314joey

iTrader: (1)

Me too, but about every twenty.

If I did it any sooner I would be changing it every six weeks.

dozer

I can only ask,what makes a lifter different in the way that it requires a lighter oil??

minxguy

It will pump up quicker with a 5W vs a 20W when cold, once warm a 5W40 is the same as a 20W40 at 210 F. It would make no difference once hot.

But once the lifter is pumped up, it is pumped up. I have never had oil drain from a hyd lifter regardless of oil viscosity.

Ken