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#103705 - 10/04/04 04:51 AM source of potassium and sodium in used oil.
kickster Offline


Registered: 05/23/04
Posts: 300
Loc: toronto
AMSOIL XL7500 UOA showed high level of Potassium (4) and Sodium (11) but no trace of antifreeze was found!

Blackstone thinks it came from oil additive but no oil or gas additive was used. they also think Sodium/Potassium may be the result of high bearing wear! Lead (15) copper (13)

What do you guys think?

some info on UOA
Amsoil XL7500 10500 miles on oil
Al 7 Average 4
Iron 86 Ave 15
copper 13 Ave 8
lead 15 ave 3
potassium 4 ave 0
Silicon 9 Ave 10
Sodium 11 ave 5
Vis 61.1 (59-65)
Flashpoint 380 (>370)
Fuel <0.5
Antifreeze 0
Insolubles 0.4

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#103706 - 10/04/04 05:21 AM Re: source of potassium and sodium in used oil.
JohnnyG Offline


Registered: 01/01/03
Posts: 323
Loc: Ohio
How about from the fuel itself?

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#103707 - 10/04/04 10:15 AM Re: source of potassium and sodium in used oil.
olympic Offline


Registered: 05/23/04
Posts: 694
Loc: Saskatchewan, Canada
My UOA's always show some sodium(not tested for potassium) and I'm confident that I don't have a coolant leak. If the numbers start trending up then that would be cause for concern.

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#103708 - 10/04/04 11:35 AM Re: source of potassium and sodium in used oil.
Silverado Offline


Registered: 10/30/03
Posts: 127
Loc: Bakersfield, California U.S.A.
I have had a trend in sodium from 5 to 10 to 15 in my last 3 UOA's which has puzzled me as well. Some other members pointed it out to me, yet I'm not sure what to make of it. I will find out pretty soon with the help of Terry Dyson's services, as I plan on chaging my oil next week.

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#103709 - 10/04/04 05:11 PM Re: source of potassium and sodium in used oil.
dickwells Offline


Registered: 06/12/02
Posts: 900
Loc: Northern Illinois
My 02 Silverado 4.3 showed sodium quite a while then the analysis company switched it to Potassium and back to sodium, they can't seem to properly differentiate them. At any rate I checked the MSDS for Dexcool and it showed a potassium compound. I had the Intake gasket changed and sure enough it was broken and leaking in at least one spot, though very slowly. I have not got my next analysis yet, just went over 3k miles on that change.

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#103710 - 10/05/04 09:28 AM Re: source of potassium and sodium in used oil.
MNgopher Offline


Registered: 09/17/02
Posts: 2868
Loc: Lakeville, MN
Sodium may also be caused by Road Salt usage in the wintertime. Contamination may come from either ingestion (through the air intake or other vacuum leak) or sample contamination (salt around the drain plug, etc...). I tend to notice a slight bump in sodium values over winter intervals as a result.

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