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High oil temp while towing: need more PAO/Ester, or more viscosity? #5459923 06/22/20 01:59 PM
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zuluplus30 Offline OP
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2017 Silverado 5.3 towing 7.5k on a routine basis now. Coolant temps hold at 207, then up to 215-220 until the fans pull it back to 207. I notice when I stop, the oil psi drops to <20 so the oil temp is definitely warm, but no gauge for accurate measurement oil temp measurement though.

My question is keep running 0w-20 Dexos (Currently on M1EP) and stay with a higher PAO/Ester oil, or step up a grade to 0w-30/5W-30 for the higher HTHS? I don't give 2 squats about MPG. This is purely for wear protection.

Edit: Almost out of powertrain warranty so viscosity in regards to warranty are moot.

Last edited by zuluplus30; 06/22/20 02:08 PM.
Re: High oil temp while towing: need more PAO, or more viscosity? [Re: zuluplus30] #5459927 06/22/20 02:08 PM
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zfasts03 Offline
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You could always shoot the oil pan with a non-contact thermometer and get an oil temp. reading.

From my understanding you do have an oil cooler, so probably all is fine. Probably also fine sticking with 0w-20 Dexos1gen2 also.


- 03 Corvette Z06
Amsoil 5w-30 SS
- 07 Honda Accord 2.4L
Amsoil 5w-20 SS
- 16 Suburban 5.3L
Amsoil 0w-20 SS, XG10575(16-28 by-pass)
- 18 4Runner TRD Off Road
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Re: High oil temp while towing: need more PAO, or more viscosity? [Re: zuluplus30] #5459929 06/22/20 02:11 PM
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hemitom Offline
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you answered your own question.

I would be running 5w30 .


2009 Saturn Vue.
2015 Mustang GT Convertible.
Re: High oil temp while towing: need more PAO, or more viscosity? [Re: zuluplus30] #5459932 06/22/20 02:16 PM
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No need to worry about wear protection with the 0W20 oil and a heavier weight oil won't necessarily give you better protection. I say you are fine with the 0W20.

Re: High oil temp while towing: need more PAO, or more viscosity? [Re: zuluplus30] #5459939 06/22/20 02:21 PM
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Modern cars with variable displacement oil pumps try to keep the oil pressure at 15 psi. so as long as you are above that you're still fine. However, piston skirts and rings and cam lobes/followers aren't lubricated under pressure.

I would probably step up a grade, the heat of summer might make the oil even thinner.


AR Giulietta 2.0 JTDM-2 -- Total Quartz 9000 Energy 0w30
Hankook Ventus V12 evo2 235/45R17
Re: High oil temp while towing: need more PAO, or more viscosity? [Re: zuluplus30] #5459940 06/22/20 02:22 PM
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Or, use a 5W20 which has less VII and uses slightly higher viscosity base oils.


"So many shows out there dumb-down the country. It's so admirable to be part of a show that wants people to think." (David Krumholtz 'Charlie Epps' of NUMB3RS)
Re: High oil temp while towing: need more PAO, or more viscosity? [Re: Eddddd] #5459941 06/22/20 02:23 PM
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kschachn Online Content
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Originally Posted by Eddddd
No need to worry about wear protection with the 0W20 oil and a heavier weight oil won't necessarily give you better protection. I say you are fine with the 0W20.

Why not? MOFT always wins. Sounds like better protection to me.

And it's a grade, not a weight.


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: High oil temp while towing: need more PAO, or more viscosity? [Re: zuluplus30] #5459944 06/22/20 02:29 PM
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Purely anecdotal ... If it were me in your shoes, 5W-30 towing in the summer.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: High oil temp while towing: need more PAO, or more viscosity? [Re: zuluplus30] #5459948 06/22/20 02:37 PM
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How do you know the oil temp is high? All I see are coolant temps in your OP. You have plenty of engine protection with that EP M1 0w-20


1993 Porsche 964, 2001 Ford SVT F-150 Lightning, 2004 Chevrolet Corvette, 2018 Toyota Tundra 5.7L
Re: High oil temp while towing: need more PAO, or more viscosity? [Re: kschachn] #5459953 06/22/20 02:41 PM
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Originally Posted by kschachn
Originally Posted by Eddddd
No need to worry about wear protection with the 0W20 oil and a heavier weight oil won't necessarily give you better protection. I say you are fine with the 0W20.

Why not? MOFT always wins. Sounds like better protection to me.

And it's a grade, not a weight.


Stand corrected. Heavier grade. There was a discussion about MOFT here on the forum. Here's the link. https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5118764/1 If going to a heavier grade helps you sleep at night, then do you. It won't hurt the engine. I have a Tundra 5.7, live in South Texas and have towed 7k+ on a regular basis using 0W20. Oil samples show no issues but then again, we are talking about a Toyota. smile

Last edited by Eddddd; 06/22/20 02:42 PM.
Re: High oil temp while towing: need more PAO, or more viscosity? [Re: MolaKule] #5459960 06/22/20 02:45 PM
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Originally Posted by MolaKule
Or, use a 5W20 which has less VII and uses slightly higher viscosity base oils.

I'm not sure if that's necessarily the case with mobil1 EP, the 0w20 is like 60-70% PAO on the SDS, the 5w20 is only 5-10%, I assume the rest is probably hydrocracked dino if they don't specify. Since there's so much PAO in the 0w20 isn't it possible that since it uses a presumably higher quality base oil that it might actually have a lower VII content than the 5w20 variant.

Re: High oil temp while towing: need more PAO/Ester, or more viscosity? [Re: zuluplus30] #5459967 06/22/20 02:56 PM
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splinter Offline
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Originally Posted by zuluplus30

Edit: Almost out of powertrain warranty so viscosity in regards to warranty are moot.
Perhaps that it has made it this far serves thusly for some as partial validation?


PUP 0W-40
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Past performance is no guarantee of future results.
Re: High oil temp while towing: need more PAO/Ester, or more viscosity? [Re: splinter] #5459985 06/22/20 03:13 PM
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zuluplus30 Offline OP
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Originally Posted by splinter
Originally Posted by zuluplus30

Edit: Almost out of powertrain warranty so viscosity in regards to warranty are moot.
Perhaps that it has made it this far serves thusly for some as partial validation?


60K miles is hardly a nod to longevity.

Re: High oil temp while towing: need more PAO/Ester, or more viscosity? [Re: Eddddd] #5459987 06/22/20 03:14 PM
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Originally Posted by Eddddd
Stand corrected. Heavier grade. There was a discussion about MOFT here on the forum. Here's the link. https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5118764/1 If going to a heavier grade helps you sleep at night, then do you. It won't hurt the engine. I have a Tundra 5.7, live in South Texas and have towed 7k+ on a regular basis using 0W20. Oil samples show no issues but then again, we are talking about a Toyota. smile

I wouldn't expect it to.


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: High oil temp while towing: need more PAO/Ester, or more viscosity? [Re: PowerSurge] #5459988 06/22/20 03:15 PM
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zuluplus30 Offline OP
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Originally Posted by PowerSurge
How do you know the oil temp is high? All I see are coolant temps in your OP. You have plenty of engine protection with that EP M1 0w-20


Pure assumption, except under normal driving the oil pressure sits about 30-35 psi at idle. After towing, it sits about 19-20 during idle. My assumption is the oil is hot and thin.

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