I have seen the results of long term storage in motor oils. I aquired several drums of unopened 30w & 10w30 that had been in storage for several years. When I drained those barrels, they all had a clear jelly-like substance at the bottom. I can only assume that the residue was some of the additive package. I doubt It was moisture since it was perfectly clear and the same colour as the oil.
Les Burt
Montreal
'75 Eleganza 26'
>
> Next time I drain a final drive, I will send off a sample of that stuff and
> have it analyzed. Then we might have a clue about this.
> Jim Hupy
>
>>
>> Watching this discussion has been kind of fun for me.
>> Why didn't I come along sooner? Because I have been working on fixing a
>> garage door most of the day and I was not at all sure how long this write
>> was
>> going to be. Actually, I still am not, but I won't quit until I am
>> done.....
>>
>> What is great here is that everybody that added something is correct.
>> What are the odds??
>>
>> If it is a multi-viz gear oil, yes, it can separate in time, but it will
>> take a long time and any agitation can re-mix it. All multi-viz lubes are a
>> mix of straight oil and viscosity improver that is temperature reactive.
>> They are highly miscible (they mix real well), but they do have different
>> specific gravity (SG). So, they can separate.
>>
>> There is almost always some wear metal in a gear case lube. It may take
>> an half a turn before it is wet, but that half matters. Even before, when
>> the gear set was new, they just about always have some break-in to do.
>> But, even after that, all the best lubricant in the world cannot avoid there
>> being some wear in working parts.
>>
>> The gear case is vented, so it can breath with temperature and barometric
>> pressure. That will introduce both oxygen and moisture to the gear case
>> volume. This is a two way gotcha.... Just about all lubricants are
>> hydrocarbons and will oxidize given the time. The moisture will also be
>> absorbed
>> (to a minor extent) by the lube oil, and it can also separate out again
>> just like you might expect, but now it can mix with the wear metal and
>> oxidized lube oil components.
>>
>> It takes a lot of oil in lube to make a visible emulsification (the milky
>> stuff). By a lot, I mean several percent and the mixing energy. You don't
>> have that good a mixer in a final drive (IMHO).
>>
>> Well, there we go folks.
>> I'm not trough fixing garage door, but I ran out of light and energy and
>> tomorrow will be just fine.
>>
>> Matt
>> --
>> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
>> Electronically Controlled Quiet Engine Cooling Fan
>> OE Rear Drum Brakes with Applied Control Arms
>> SE Michigan - Twixt A2 and Detroit
>>
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