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3RZ 235k miles Rotella 5W-40 5k interval #4679333
02/27/18 12:41 AM
02/27/18 12:41 AM
Joined: Oct 2010
Posts: 780
GA
JZiggy Offline OP
JZiggy  Offline OP
Joined: Oct 2010
Posts: 780
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?


Basic,, Simple,
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4679430
02/27/18 08:24 AM
02/27/18 08:24 AM
Joined: Jun 2015
Posts: 4,225
New England
Virtus_Probi Offline
Virtus_Probi  Offline
Joined: Jun 2015
Posts: 4,225
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.


2014 Forester XT, 86000 miles
Last Change;
M1 5W30 d1G2
Tokyo Roki 15208AA170 filter
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4679453
02/27/18 09:04 AM
02/27/18 09:04 AM
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JZiggy Offline OP
JZiggy  Offline OP
Joined: Oct 2010
Posts: 780
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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.


Basic,, Simple,
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4679515
02/27/18 10:33 AM
02/27/18 10:33 AM
Joined: Dec 2002
Posts: 4,153
The Garden State
Whimsey Offline
Whimsey  Offline
Joined: Dec 2002
Posts: 4,153
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

Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4679561
02/27/18 11:25 AM
02/27/18 11:25 AM
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Posts: 780
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JZiggy Offline OP
JZiggy  Offline OP
Joined: Oct 2010
Posts: 780
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.


Basic,, Simple,
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4682137
03/02/18 11:10 AM
03/02/18 11:10 AM
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JZiggy Offline OP
JZiggy  Offline OP
Joined: Oct 2010
Posts: 780
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Blackstone agrees the sodium is likely carryover from the previous fill. Since there is zero potassium the likelihood of coolant is small.


Basic,, Simple,
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4682191
03/02/18 12:05 PM
03/02/18 12:05 PM
Joined: Jun 2014
Posts: 2,453
Phoenix, Arizona - USA
SirTanon Offline
SirTanon  Offline
Joined: Jun 2014
Posts: 2,453
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.


2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 262,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 57,000mi
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: SirTanon] #4683716
03/03/18 11:57 PM
03/03/18 11:57 PM
Joined: Oct 2010
Posts: 780
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JZiggy Offline OP
JZiggy  Offline OP
Joined: Oct 2010
Posts: 780
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!


Basic,, Simple,

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