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3RZ 235k miles Rotella 5W-40 5k interval #4679333 02/27/18 12:41 AM
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JZiggy Offline OP
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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
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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, 114800 miles
Last Change;
Valvoline AFS 5W30
Tokyo Roki 15208AA170 oil filter
Subaru 16546AA10A air filter
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4679453 02/27/18 09:04 AM
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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.


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Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4679515 02/27/18 10:33 AM
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Whimsey Online Content
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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
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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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Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4682137 03/02/18 11:10 AM
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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.


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Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4682191 03/02/18 12:05 PM
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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.


2013 Nissan Altima SV - 2.5 liter/CVT - 125,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 68,000mi
2010 Ford Fusion - 274k mi - SOLD
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: SirTanon] #4683716 03/03/18 11:57 PM
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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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Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4884692 10/01/18 04:24 PM
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Another 5000 miles, another oil report. Seems pretty much the same with some lingering sodium for some reason. What else can this come from...?

[Linked Image]


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Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4884877 10/01/18 07:22 PM
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Well, at least it is tracking down. I would, however, have expected it to come down more than this, unless 3/4 of the sump remains behind during on oil change. wink How many fills has it gotten since the last Valvoline one?


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: Garak] #4884879 10/01/18 07:28 PM
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Before 230,000 miles it was running Valvoline. At 230,000ish it got T6 plus a new filter. I then changed the oil (T6) without changing the filter at 235,000 and did a UOA on this oil. At 240,000 I changed both oil and filter and did a UOA. Perhaps retaining the filter at 235,000 allowed the residual Valvoline to continue to carry over?


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Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4884981 10/01/18 08:33 PM
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So, it hasn't been all that long. I'm not sure of the filter size, but irrespective of that, a filter will retain some oil. It still seems a bit high, but I have no idea how much used oil that engine retains, let alone with the oil filter being kept. So, all you can really do is keep monitoring it. I'd have thought it would have come down quicker, but given how recent the Valvoline was, and the filter hanging on, at least we have a somewhat plausible explanation.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: Garak] #4885561 10/02/18 02:41 PM
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That's my thinking too. The cooling system never loses a drop so I'm not really concerned about a leak. I guess I'll just have to get another UOA next year smile

The wear metal values are consistent so far and confirm me thinking that this 3RZ has lots of life left in it.


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Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: JZiggy] #4892337 10/09/18 09:30 PM
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I should think so. Stick with it and see how it goes. I get antsy switching batch numbers, let alone brands, and I don't even do UOAs. wink


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: 3RZ 235k miles Rotella 5W-40 5k interval [Re: Garak] #4892755 10/10/18 10:33 AM
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Thanks Garak!

I did an oil pan gasket job on this engine. Should I expect the next fill to show anything weird because of it? Si from the silicone rubber...?


Basic,, Simple,
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