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Author Topic:   lower unit oil color
hottiger posted 04-02-2003 08:51 AM ET (US)   Profile for hottiger   Send Email to hottiger  
oil was grey in color, changed all seals "0" rings ran motor now oil is a solid mustard yellow color. Is this normal are should i investgate further. I' am using penzoil. I also put in a new water pump.
jimh posted 04-02-2003 08:55 AM ET (US)     Profile for jimh  Send Email to jimh     
Grey Poupon color?

Fromm your description of its appearance it suggests that the oil has become an emulsion of water and oil.

Another description of the typical color is "coffee with cream".

I don't recall ever hearing of a "yellow" tint, but that would vary with the color of the original oil.

whalerron posted 04-02-2003 11:53 AM ET (US)     Profile for whalerron  Send Email to whalerron     
After usage, make sure you let the motor sit for a few days before you drain the oil. If you drain it right after running the motor, I have found that there can be a tremendous amount of very small air bubbles suspended in the oil. These bubbles give the oil a more "solid yellow" color. If you give the air bubbles time to rise out of the oil, you will get a better indication of the true color of the oil.

You should also drain the oil into a glass jar and let it sit for a day. Any water that is in the oil will separate out from oil and fall to the bottom of the jar. If there is water in the oil, it will be very noticeable in the bottom of the jar.

PFSQUAN posted 04-02-2003 02:37 PM ET (US)     Profile for PFSQUAN  Send Email to PFSQUAN     
If the oil is more silver than gray, it can indicate particles of the gear teeth. Also, it is important to be sure as much oil as possible has been drained before replenishing. Otherwise, the new clean oil will be contaminated by the residue. My lower unit comes out looking golden, much the way it went in.
raygun posted 04-02-2003 04:02 PM ET (US)     Profile for raygun  Send Email to raygun     
hottiger,
Penzoil what exactly?
rmart posted 04-02-2003 09:38 PM ET (US)     Profile for rmart  Send Email to rmart     
JimH, is the "coffee with cream" color the color I want to see when I change the lower unit oil or is this the color which indicates water intrusion?
Sal DiMercurio posted 04-02-2003 10:08 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
No, you don't want coffee with cream, or milkshake.
Why don't you used the oil the company that made the engine sells ?
Some lower unit greases are a blend of synthetic & regular grease.
Believe me, your not saving money by skimping on engine or lower unit oils, as those are the blood of your engine.
I see people buying outboards that cost $15,000 & more & these people are buying the cheapest oil they can find,.......penny wise & dollar foolish.
Sal

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