minxguy

When someone says "racing" in a lubricant application don't get too excited. A "racing" lubricant usually has less additive content because the product isn't used for long periods of tome. The oil is usually changed after a race and when the new oil is poured in so isn't a whole new slug of additives. Not the best use for a boater, (unless you are racing). As I have stated on this thread before, a motorcycle oil contains a higher slug of additives, ( especially the anti-wear ones) than auto product. Try Spectro Golden 4 motorcycle in a 20w50 viscosity for your boat. It will stay in grade, provide extremely high levels of anti-wear and detergency, and most important, won't disappoint. Ken

Hydrocruiser

Lots of boat racers use the Amsoil 20W-50 Severe Service Racing Oil...my humble opinion is that IT ROCKS...

15W-40 Marine Amsoil is fine in a 7.4 stock engine by the way.

Hydrocruiser

"Racing" can mean a low detergent oil for less chance of detonation that is used for "one race". That is very true of some conventional oils and Redline.

Amsoil Severe Service Racing has all the good additives and detergents....and it can be used for a normal service period.

Most motorcycle oils are able to offer more phosphorous (ZDD"P") as motorcycles do not have cataylic converters that can be plugged up by this great anti-wear pressure additive.
Some automotive oils have reduced levels of ZDDP because of this. FYI M-1 EP Synthetics have good doses of ZDDP.

Rage

Hydrocruiser,

What are the pros and cons of M1 V-Twin versus M1 EP in a marine engine?

Hydrocruiser

It is not a matter of pros and cons but rather a matter of matching one of these fine oils to your specific application.


The M-1 EP 15W-50 has a great base and great ZDDP levels and excellent detergency as well. It is well suited to most offshore applications and many here use it and have great results to share. I have found it going for about $5.45/qt.

If you race or like spending a lot of time at WOT; have hopped up mills or want the MOST protection available.. then move up to a Premium Synthetic like M-1 20W-50 V-Twin as it has even a tougher base and more anti-wear additives with a beefed up detergency chemistry to match. I have bought it for as little as $7.00/qt.

minxguy

Some motorcycle manufactures,(BMW in particular has been selling their brand of engine oil for approx. 20 years. The last 8-10 years BMW has been installing cats on their motorcycles. The ZDDP levels that BMW uses in their lubricant is one of the highest in the industry. To my knowledge they have not had any problems with bad cats due to higher level of ZDDP. Ken

Rage

Hydrocruiser,

Do you loose any rpms going from the Mercury 25W40 to the M-1 V-Twin 20W50 with fully warmed engine?

vandy021

No, you see no RPM dif at all. We used it in 1050 Sterlings and in 1075 Mercury SCi's.

Hydrocruiser

I was asked what might be a better choice than 10W-30 M-1 in C-6 Corvette engine?

Well I do think that 10W-30 Mobil-1 is a good choice especially if you change frequently anyways....

If you want:

-Boosted levels of anti-wear additives
-Faster flow to critical engine parts
-Helps protect supercharged, turbocharged, and high revving engines.

Try this along with a M-1 oil filter:

Hydrocruiser

Also, no difference is seen in 525's from my experience when warmed up.