4bus

iTrader: (4)

That is true, however high zinc in an engine that doesn't have a flat tappet still helps! Zinc is bad for catalytic systems, which is why it has been nearly removed from "on road" oils. However, it is a superior additive. If you don't have cats on your boat I would suggest running a ZDDP additive, or a high zinc oil.

I run Valvoline 20W50 VR1 syn plus a Zddp additive


"Quaker State engineer Mark Ferner said zinc's extreme pressure qualities also aid in reducing piston ring-to-cylinder bore wear at BDC and TDC, where the rotating assembly sees an abrupt change in velocity and direction. Besides its extreme pressure protection, multifunctional zinc also functions as an antioxidant. That is, things exposed to heat and oxygen are subject to oxidation. In the case of a ferrous metal like iron, oxidation causes corrosion, which we see as rust. As applied to motor oil, Ferner said as the "heat accelerates oxygen, the oil starts to oxidize and thicken, changing into other molecular combinations. As the oil thickens, it forms deposits or varnish. In motor oil, the antioxidant additives first sacrifice themselves to prevent this oxidation from occurring, but if they get overwhelmed, the oil eventually turns into a hard, crusty sludge."

In its antioxidant role, zinc fights heat buildup in various hot spots like the piston-to-piston ring interface and the underside of the piston itself. Oil can accumulate in the honing crosshatch marks in the cylinder bore where it is exposed to combustion temperatures as high as 400-450 degrees F, a prime candidate for oxidation if not protected. Today's modern reduced-zinc passenger-car street oils contain other dedicated antioxidants to make up for the loss of zinc. "

07DominatorSS

Meets SN rating, therefore it probably DOES NOT have enought zinc in it for most boating applications.

Thunderstruck27

Do you know this to be true...or are you just doing some "synthetic" thinking?

Drock78

iTrader: (2)

I just scored a bunch of the Valvoline VR-1 synthetic from O'Rileys for 3.79/qt.

4bus

iTrader: (4)

You sure it is syn? The non syn is normally $6 and syn is $10, that would be a killer deal!

abones

I agree I have been using Valvaline racing straight 40w oil along with a bottle of ZDDP for the last 13 years in my motors never a problem with the rotating asm and I run them very hard for extended periods!

boatrider82

Dont mean to highjack but where is everybody buying there ZDDP from

Drock78

iTrader: (2)

Yup. They are no longer going to carry the synthetic because they don't sell much of it so they are liquidating it...atleast here in my area. I bought all that they had and were able to get from other stores and distribution center.

minxguy

dt21, you have your Groups mixed up. A true PAO synthetic is a Group IV and the "synthetics by law" are Group III.

NOBODY CAN PRODUCE A GROUP IV SYNTHETIC AND RETAIL IT FOR $4.00, not even Mobil and they are one of the worlds largest, if not the largest producers of PAO base stocks.

Ken

TylerBurich

The napa synthetic is same as valvoline synpower other than the fact that they dye it a little different. This sale runs all month and is a great deal for autos and light trucks. I would not use it in a boat.