aged oil

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2,435
Location
Mizzou-land
Can additives precipitate out of unused oil? I used a couple of bottles of my BC stash last night. I was trying to accurately blend two oils and was using a clear graduated cyclinder. I would dump the oil into the cyclinder and then leave the bottle upside down to allow the last drops to fall. The point of this intro it to explain that I could see the last drops very well when they hit the rest of the oil. To my surprise they were not clear like the rest of the oil. There was a sediment/precipitate in the bottom of the bottle. The last drops were milky. Were these last drops full of "crud"? Alternatively, is a portion of the additive package NOT in solution? If not in solution, did if precipitate or was it never in solution? I recall Terry suggesting at some point (an maybe in humor) that for a particular brand, one should shake before use. I think that comment may apply here.
 

Kestas

Staff member
Messages
13,981
Location
The Motor City
It may be crud. In our lube lab, the specialist got a complimentary pail of Dex 6 from the manufacturer. Anal as he is with lube for his rusty truck, he proceeded to filter all the fluid down to 0.45 micron. He made a comment that there was a fair amount of crap in the lube... not unusual for something that is industrial grade. The only way to know for sure is to filter, separate, and analyze the precipitate that you find at the bottom of your bottles. I do this for a living. Anything else is pure speculation.
 
Messages
5,722
Location
Charlotte, NC
When I was using GTX I used to see a small amount of brown residue in the bottom of the bottles. Never thought much about it. I guess it ended up in my drain oil.
 
Messages
2,233
Location
Wisconsin
quote:
The last drops were milky.
Could be a slight amount of moisture contamination in the oil, it's not uncommon for moisture to show up in a VOA report. While I concede that little, if any, settling out occurs with today's additives, when in the oil aisle, I still can't help but pick up the clear plastic bottles of Quaker State & peer at the bottoms for any signs of additive fallout! [Smile]
 
Messages
165
Location
australia
i had the same experience as okdmoparguy. castrol gtx in new zealand had a very small amount of sediment in the bottom of the pack. i never poured it into my engine
 
Messages
3,492
Location
Millbrae, CA
Additive fall out is/will be more common with GPII and GPIII oil due to soulubility and or age. VII's and detergent would be the most insoluble. aswell as Moly and boron bruce
 
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