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High RPMs...thick or thin? #4977477 01/12/19 10:26 PM
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Doublehaul Offline OP
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If you had a vehicle that was going to spend hour after hour at an RPM range of around 3-3500...would you be better off running a 0w20 or say a 0w40 assuming both were allowed by the OEM


2019 Toyota 4Runner 4x4 TRD
2019 Toyota Tacoma 4x4 TRD*

Mobil 1 0w40


The specs on the back are more important than the label on the front
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977479 01/12/19 10:29 PM
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StevieC Offline
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0w40 for hour after hour repeatedly. Normal driving where this isn't the case (as a contrast) I would go with the 20wt no problem.

Last edited by StevieC; 01/12/19 10:30 PM.

'18 Caravan - 42k KM - AMSOIL SS 0w20, Fram Ultra, TC-W3 500:1
'06 Santa Fe - 535k KM (Retired)

There is no such thing as "lifetime" fluids! mad
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977486 01/12/19 10:36 PM
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Rand Offline
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what vehicle? what engine? what load? 3500 in the parking lot?

what oil temps?

In general its ok to be thick you lose a little fuel economy in most engines

too thin can cause damage.. so I'd err on the side of thickness.

That all being said in a water cooled engine used normally (not raced or towing a load/trailer up a mountain for 30min or more.
its not all that important to use anything thicker than recommended.


2019 Jeep Cherokee Trailhawk 2.0T
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977490 01/12/19 10:38 PM
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eljefino Offline
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Oil pump will make plenty of pressure and flow at that RPM, keep it thin, or, hey, stock!

Going thicker will just bypass more and have less flow to take the heat away.

Re: High RPMs...thick or thin? [Re: Doublehaul] #4977492 01/12/19 10:39 PM
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Zee09 Offline
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Given your login name...... 0w40 smile


"If I walked on water, they'd say I couldn't swim."
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977503 01/12/19 10:51 PM
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Bryanccfshr Offline
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0w40
For the HTHS. If you have driven your Tacoma much on the interstate yet you will realize that anything over 70 mph the transmission will downshift from 6 to 5 and find its happy place in 4th if there is any headwind , hill or heavy load. So you will be in that rpm range a lot if you take many long interstate tripsat 75-80. The faster you go the higher the load due to the nature of driving a brick into the wind.
I am not afraid of 0w20, I am running my toyota care oil toward its 5k. Then the 0w40 goes in for 5k. One more toyota care oil change after that and I can run higher HTHS oil full time and push it a little longer perhaps.
I run nearly 400 miles, 240 of it @80 mph every couple of weeks, to and from where I work rotationally.
So hours of hours of sustained 3500 rpm and there is a load on it, the truck wouldn’t stick to 4th to stay in the power band if there wasn’t.

5th and 6th are more handy at 50-60mph, for fuel economy,

Last edited by Bryanccfshr; 01/12/19 10:53 PM.

2018 Trd Pro 4Runner
2018 Tacoma off-road

Dealer 0w20 to M1 0w40 FS -it depends
Re: High RPMs...thick or thin? [Re: eljefino] #4977507 01/12/19 10:54 PM
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Shannow Offline
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Originally Posted by eljefino
Oil pump will make plenty of pressure and flow at that RPM, keep it thin, or, hey, stock!

Going thicker will just bypass more and have less flow to take the heat away.


Sorry mate, that's not how it all works.


If it's the truth....it can handle the pressure !!!
Re: High RPMs...thick or thin? [Re: eljefino] #4977510 01/12/19 10:56 PM
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Bryanccfshr Offline
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All of those post and you don’t understand that hydrodynamic lubrication tenacity improves with viscosity. You can not pump a fluid wedge into a journal bearing.
Originally Posted by eljefino
Oil pump will make plenty of pressure and flow at that RPM, keep it thin, or, hey, stock!

Going thicker will just bypass more and have less flow to take the heat away.


2018 Trd Pro 4Runner
2018 Tacoma off-road

Dealer 0w20 to M1 0w40 FS -it depends
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977517 01/12/19 11:04 PM
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CT8 Offline
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0w-40.


2015 F150 2.7
2018 F350 6.2
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977531 01/12/19 11:29 PM
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gregk24 Offline
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IF manufacturers allows both grades, I would go with the 0w40.


2012 Honda Accord EX-L K24z3
58,xxx miles
PPPP 0w20 / Fram Ultra

2014 VW Jetta SE 1.8T ea888
50,xxx miles
Castrol Edge 0w40 / OEM filter
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977544 01/12/19 11:46 PM
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Linctex Offline
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That sounds like my OLD 1-ton F350 dually with 4.10 gears.... hours and hours at 3000+ RPM

SAE 30 and 15W-40 is all it has run on.... those HD (diesel type) oils will last you just fine


"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 RPMs...thick or thin? [Re: Doublehaul] #4977551 01/12/19 11:57 PM
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wemay Offline
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xw40


2018 KIA Sportage LX 2.4 AWD:
EDGE EP 5W30, PH9688

2013 Hyundai Santa Fe Sport 2.0T:
EDGE EP 5W30, PH9688
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977565 01/13/19 12:24 AM
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dave1251 Offline
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We need more information. What is the oil temp, how many quarts of oil, the engine, load and a few more tidbits will help. In reality the OEM does similar testing with recommended grade prior to production.


make the inside of your engine oil cap white.
don't use.
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977573 01/13/19 12:39 AM
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edyvw Offline
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Originally Posted by Doublehaul
If you had a vehicle that was going to spend hour after hour at an RPM range of around 3-3500...would you be better off running a 0w20 or say a 0w40 assuming both were allowed by the OEM

Same dilemma.
I need high rpm's to keep up and pass traffic on I70 going to ski. Once I hit I70 in Denver toward ski resorts I am above 4,5000 rpm's for 45 minutes or more, hitting regularly redline on altitude between 5,800ft and 12,000ft going up some really steep grades at that rpm.
I added last time 2qts of 0W40 (old version) i had left over from my CC I used once. But I am seriously thinking next week to switch completely to 0W40 FS.
How is your mpg on your Toyota's after switching to 0W40 (not my primary concern, just asking)?


15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: High RPMs...thick or thin? [Re: Doublehaul] #4977580 01/13/19 12:46 AM
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Onetor Offline
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the latter.


N = R* x fp x ne x fl x fi x fc x L
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