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#4679333 - 02/26/18 11:41 PM 3RZ 235k miles Rotella 5W-40 5k interval
JZiggy Offline


Registered: 10/12/10
Posts: 780
Loc: GA
Hey folks,

First oil analysis on my 99 4Runner with 3RZ-FE engine. At the time of the oil change the engine oil (Rotella 5W-40 CJ-4) had about 5000 miles on it and the engine had 235k.



Everything looks good except for the 180ppm of sodium. The lab states that they think it comes from the oil additives but both the CJ-4 and CK-4 VOAs don't show sodium: https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4490450/1/Shell_Rotella_T6_5W40_CJ-4/SM_

Comments?
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#4679430 - 02/27/18 07:24 AM Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3970
Loc: New England
You're right that sodium would not be expected in any Rotella 5W40...did you use a different oil for the change before this one?
Maybe something like Valvoline or Royal Purple? There could be some carryover...
I'd think you would have potassium as well if there was a coolant leak, but maybe that would depend on exactly what type of coolant you used.
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2014 Forester XT, 80500 miles
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#4679453 - 02/27/18 08:04 AM Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy]
JZiggy Offline


Registered: 10/12/10
Posts: 780
Loc: GA
Virtus, thanks for the thoughts.

My previous fill was Valvoline Synpower 5W-30. Perhaps that's part of the issue. Would you expect that much Sodium carryover to be possible?

Coolant is factory Toyota Red.
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#4679515 - 02/27/18 09:33 AM Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy]
Whimsey Offline


Registered: 12/22/02
Posts: 4049
Loc: The Garden State
Originally Posted By: JZiggy
Virtus, thanks for the thoughts.

My previous fill was Valvoline Synpower 5W-30. Perhaps that's part of the issue. Would you expect that much Sodium carryover to be possible?

Coolant is factory Toyota Red.


Valvoline oils have high sodium as in their add pack so it could well be a carry over. As stated if you had an internal coolant leak your potassium level likely would be high, it's not. I find it interesting that oil has lower calcium and higher magnesium as with Dexos 1 gen 2 oils to combat LSPI. It's even higher in ZDDP which also helps combat LSPI. The UOA looks real good for a 200,000+ mileage vehicle.

Whimsey

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#4679561 - 02/27/18 10:25 AM Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy]
JZiggy Offline


Registered: 10/12/10
Posts: 780
Loc: GA
Good info about the potassium. I also am not aware of any chance in coolant levels and no other evidence of contamination.

Maybe I'll run another UOA later and see if the sodium goes away. This next fill is T6.
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#4682137 - 03/02/18 10:10 AM Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy]
JZiggy Offline


Registered: 10/12/10
Posts: 780
Loc: GA
Blackstone agrees the sodium is likely carryover from the previous fill. Since there is zero potassium the likelihood of coolant is small.
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#4682191 - 03/02/18 11:05 AM Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy]
SirTanon Offline


Registered: 06/23/14
Posts: 2160
Loc: Phoenix, Arizona - USA
I frequently use Valvoline - Usually MaxLife and/or NextGen, but sometimes Synpower - and I frequently see this kind of sodium carry-over. If that was your last fill, then I wouldn't worry about it at all, especially since the potassium is 0.
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2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 257,000mi
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#4683716 - 03/03/18 10:57 PM Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: SirTanon]
JZiggy Offline


Registered: 10/12/10
Posts: 780
Loc: GA
Originally Posted By: SirTanon
I frequently use Valvoline - Usually MaxLife and/or NextGen, but sometimes Synpower - and I frequently see this kind of sodium carry-over. If that was your last fill, then I wouldn't worry about it at all, especially since the potassium is 0.


Thanks, that is very helpful!
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