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I have a list of MSDS sheets of many of Merc's products which show the manufacturer :)
I posted this elsewhere:

Quote:

Originally Posted by SB

Most engine oils are from Citgo. Including the 20W-40 and 25W-50.
Most greases from Chemtool.
Fuel Stabilzer from Shrader Canada Ltd
Fuel System Treatment & Stabilizer (Concentrate) from Gold Eagle Co (this should ring a bell )
================================
Mercury Gear Lube - High Performance
Year of MSDS Form - 2011
Bel-Ray Company, Inc.
P.O. Box 526
Farmingdale, NJ 07727
United States of America

==============================

Mercury / Quicksilver Premium Grade Gear Lube
Year of MSDS Form - 2008

MFR: CITGO Petroleum Corporation
P.O. Box 3758
Tulsa, OK 74102-3758

Quote:

Originally Posted by BUP (Post 4553982)

Motorcycle oils are made for gear synchronization and allowing some friction for the internal clutch packs - many people in the bike world have had clutch slippage issues when using medium to high base moly formulated oils in their motorcycles. (Basically in laymans terms engine oils that are too slippery)

There is a reason that a bike is pictured on the bottle. I understand u have not had a failure using this motor oil but most likely would not have any failures with straight 40 w bought under the O Reilly's name either. Current Motor oils is not the primary factor of engine failure anyways. overheat, detonation, poor fuel and or fuel systems issues, dirt, lack of maintenance - totally wrong motor viscosity, and so on are. the root of engine failures. Just my 2 cents

Quote:

Originally Posted by Baja Rooster (Post 4553992)

In particular around 2005 when slipper clutches came on the scene in motorcycles we had to revert back to the dinosaur oils until they added friction modifiers into the synthetics.

10-4 on the above. Don't use Rotella Semi-Syn in a motorcycle!!! Do use the Full-Synthetic though, go figure as it doesn't have the moly the semi does. Used full for years in multiple wet clutch road racing motorcycles with and without slipper clutches and without issue. Used Semi in a dry clutch bike, no issue.

Since we know 25w50 is 50 weight at 212* The question is what is viscosity at 180* where most of us run . Probably less that 50weight .
So if I want 50 weight protection the only way would be to use a straight 50 weight oil. Right? Otherwise at lower temps it could be 30weight..

LOL.
No crickets here, but lots of peepers and just as annoying. Few thousand around me that won't shut up right now. LOL.
https://www.youtube.com/watch?v=dy1z7WU8kQ0

maybe a few rounds of .45 might shut them up?

Quote:

Originally Posted by ICDEDPPL (Post 4554937)

Your hearing cricket sounds because maybe nobody on here can answer your question with 100% certainty.The first number of a multi viscosity oil followed by a "W" means winter viscosity. The W does stand for winter. This portion of the viscosity grade is determined at a very cold temperature. I am not sure what that temperature is, but, I'm pretty certain it's well below zero. So, in your case the 25W pours like a 25 viscosity at say 0 degrees. You are correct that the second number, in this case 50 is measured at 212F. So, here is where it gets confusing. As the temperature of the engine oil increases, the viscosity decreases, and vice versa. So, that being a true statement, which it is, could lead you to believe the oil is thicker at 180. I don't know the answer.

my cricket hears FLOW RATES.

Quote:

Originally Posted by mike tkach (Post 4555226)

my cricket hears FLOW RATES.

Haha. Your cricket needs to be a bit more specific than that.........FLOW RATES doesn't answer the question as to what the weight of the oil is at 180 degrees.