Offshoreonly.com - Marine Lubrication

Just a brief comment...

I pick an oil...one that appears to be good....run it for say 15-20 hrs...do an oil analysis...if it is good in my application I know... if not try a new product.

I have found in testing Mobil-1/Amsoil/Redline and RP.. that they all were great. Never found one to be "bad"...

The biggest mistakes I feel in choosing a synthetic or any oil... is getting the wrong viscosity for the wrong engine/climate; especially if it is cold out and the oil is too thick.

Rage	01-05-2009 10:02 AM

What would be the coldest ambient temperature that one could still run a 20W50 like Amsoil Series 2000 race oil in a marine engine (Merc 496) with closed cooling and 120F thermostat that runs ~135F coolant temperature when warmed? The bearing cllearances are now ~0.0025" and ~0.003" mains with HV oil pump. 30F?

Quote:

Originally Posted by Hydrocruiser (Post 2770063)

Rage	01-05-2009 11:21 AM

1 Attachment(s)

Hydrocruiser,

I combined your data with mine.

The Silver Cap is only a few % points less Zn and P than the first line oils listed. I guess the big difference is its base stock is not 100% syn so viscosity stabilitry and byproducts of petrolium base oil breakdown with use is the shortfall?

Thoughts?

Rage	01-05-2009 11:24 AM

Quote:

Originally Posted by Mentalpause (Post 2768481)

Are those gallons or 5 quart jugs? I thought they were 5 quart jugs.

Good question. I just ASSUMED that they were gallon jugs. I did not know there was such a thing as 5 quart jugs. TBD.

minxguy

01-05-2009 11:41 AM

The water would freeze and 20w50 oil will pour.
The important temp is running temp of the oil and it should be over 180F.

To qualify as a 20w oil you must meet a spec in the cold cranking simulator of 9500cP (centipoise) at -15C ASTM D 5293.

If you use a 20w50 in cooler temps, just make sure it is good and warm before you start applying lots of throttle.

Actually, no matter what oil you use you should make sure it good and warm before you run hard.

Ken

Rage	01-05-2009 12:35 PM

Thanks.

I am adding an oil temperature thermostat (195F) and gage so that will not be a problem. I just was not sure if the initial flow through the bearing clearances during cold starts/idle would be abequate so as to not be a problem before oil is warmed. I have always idled until the engine coolant temperature is stabilized warm.

Quote:

Originally Posted by minxguy (Post 2770990)

Hydrocruiser

01-05-2009 04:44 PM

Quote:

Originally Posted by Rage (Post 2770972)

Additive wise Motul uses Mg mostly and Amsoil Ca..which is fine.

The Motul is a double ester base and they sstill say V-Twin in a Grp iv/v. The high the basestock the more resistance to shear.

The M-1 SilverCap is a great value as it is right up there and priced nicely.

07DominatorSS

01-05-2009 04:57 PM

Quote:

Originally Posted by Rage (Post 2771027)

The new AMSOIL 15w-50 has a cold pour point of -36F. I don't think you will be boating in temperatures like that, so that should not be too much of an issue.

Mentalpause

01-05-2009 08:49 PM

Quote:

Originally Posted by Rage (Post 2770976)

Good question. I just ASSUMED that they were gallon jugs. I did not know there was such a thing as 5 quart jugs. TBD.

My wife got me 4 jugs of silver cap for Xmas. They are 5 quarts each.