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#4499197 - 08/27/17 07:48 AM Running 0w40 or 5w40
Camprunner Offline


Registered: 02/19/08
Posts: 1034
Loc: MA.
Just wondering who here is running either 0w40 or 5w40 when there car or truck recommends either a 20 weight or 30 weight oil?

I have used M1 0w40 in my 2012 Nissan Pathfinder V6 and noticed no difference in fuel millage and my idle seemed to improve for the full OCI.

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#4499201 - 08/27/17 07:59 AM Re: Running 0w40 or 5w40 [Re: Camprunner]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Why would viscosity effect idle?
_________________________
Multiple Diesel and Gasoline vehicles

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#4499207 - 08/27/17 08:08 AM Re: Running 0w40 or 5w40 [Re: ArcticDriver]
Camprunner Offline


Registered: 02/19/08
Posts: 1034
Loc: MA.
Originally Posted By: ArcticDriver
Why would viscosity effect idle?


I am as confused about that as you are?? I just can't explain it.

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#4499243 - 08/27/17 08:48 AM Re: Running 0w40 or 5w40 [Re: Camprunner]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Originally Posted By: Camprunner
Originally Posted By: ArcticDriver
Why would viscosity effect idle?


I am as confused about that as you are?? I just can't explain it.


What do you mean with "Improved Idle"?

Is this a difference in idle RPM at the tach? Or do you mean it just "feels" smoother, quieter, etc..?

I have found that a different motor oil can result in different engine "feel" just like a fresh oil change using the same brand oil.
_________________________
Multiple Diesel and Gasoline vehicles

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#4499291 - 08/27/17 09:46 AM Re: Running 0w40 or 5w40 [Re: Camprunner]
Camprunner Offline


Registered: 02/19/08
Posts: 1034
Loc: MA.
Since day one my 4.0 in my Nissan has always had a significant amount of vibration that you can feel threw the drivers seat and through the steering wheel. The vibration seems to go away with adding more rpm at idle and it is not felt when driving. When I run a 0w40 the idle seems to increase just enough so the vibration can't be felt and I also get less engine noise so it seems.

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#4499325 - 08/27/17 10:20 AM Re: Running 0w40 or 5w40 [Re: Camprunner]
EyesofThunder Offline


Registered: 02/24/10
Posts: 79
Loc: North Central Illinois
Is it a variable valve timing engine? The change in viscosity could change the cam positioning some. Lower overlap at idle smooths idle.

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#4499346 - 08/27/17 10:31 AM Re: Running 0w40 or 5w40 [Re: Camprunner]
92saturnsl2 Online   content


Registered: 03/02/04
Posts: 1279
Loc: Flaherty, KY
I'm currently using Pennzoil Ultra Platinum 5w-40 in a '04 Odyssey with J35A4 engine that specs 5w-20. I did it this summer in an effort to combat oil consumption (with 5w-20, it'd use about 2.5 quarts in a 6-7k OCI); it's too early to tell yet if it's helped in that regard.

Since purchasing it at 130k miles (has about 175k now), I'd only used 0w/5w-20 and once or twice used Mobil1 0w-30 AFE. I really can't tell the difference between any of them, the engine runs the same and had always used about the same amount of oil regardless of what was used. The 5w-40 this time is a curiousity thing, to see if it might help. I feel like it may not rev as fast, perhaps not as responsive using the thicker oil, but the difference is minimal. This engine has VTEC and the thicker oil has made no difference with the VTEC solenoid that activates the second cam profile.
_________________________
1985 F-250HD 7.5L 4x4 135k- Maxlife 15w-40 HDEO [for sale]
04 Odyssey EX 180k PUP 5w-40
96 Maxima GLE 248k Castrol Edge 5w-50
07 Chrysler Pacifica Limited

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#4499406 - 08/27/17 12:06 PM Re: Running 0w40 or 5w40 [Re: Camprunner]
Rolla07 Offline


Registered: 11/05/11
Posts: 4737
Loc: MTL, CANADA
Ive run 0w40 on my car that specs 5w30. No issues or change in consumption. Ive also run 0w20 and 5w20 with no noticeable difference. Once back in day someone put 5w50 in and I did notice a significant decrease in gas mileage.
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4499445 - 08/27/17 01:05 PM Re: Running 0w40 or 5w40 [Re: Camprunner]
mclasser Offline


Registered: 04/13/13
Posts: 2229
Loc: The Northeast
I've used M1 0w40 (old formulation) in my Infiniti that calls 5w30. No scientific data but the engine sounded very smooth.
_________________________
2018 Hyundai Elantra VE -- 3K
2013 Honda Pilot EX-L 4WD -- 55K
2002 Honda Accord EX-L -- 210K


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#4499585 - 08/27/17 04:22 PM Re: Running 0w40 or 5w40 [Re: Camprunner]
EyesofThunder Offline


Registered: 02/24/10
Posts: 79
Loc: North Central Illinois
I've often wondered are the variable valve timing, VVTi, VTEC, etc THAT sensitive to oil viscosity?

Some say that xW20 oils are only spec'd in the US/North America and not overseas, IF that is true (I can't figure out how to find out), do the OEM's change the variable valve timing orifices?

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#4499652 - 08/27/17 05:54 PM Re: Running 0w40 or 5w40 [Re: Camprunner]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1227
Loc: Oregon
0W-40 is typically a thinner base oil with more viscosity index improvers to achieve KV100, hence why they usually have higher NOACK figures versus the same oil in 5W-40. Typically a better quality base-stock, though, to achieve 0W pour point and cold crank.
_________________________
2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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#4499745 - 08/27/17 07:47 PM Re: Running 0w40 or 5w40 [Re: Camprunner]
dblshock Offline


Registered: 04/24/07
Posts: 2655
Loc: WI.
Civic at 25k now.. 12k on 0/40, better upgrade early to avoid excessive wear...upgraded that the fuel and UHP tires, real nice.


Edited by dblshock (08/27/17 07:48 PM)
_________________________
16 Civic Coupe Touring
640:1 TCW-3 E091
Edge 0/40/XG7317
Firehawk Indy 500

06 4Runner SR5 135k
640:1 TCW-3
M1 0/40 XG3614
Falken Wildpeak AT3W

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#4499823 - 08/27/17 09:10 PM Re: Running 0w40 or 5w40 [Re: Camprunner]
Vladiator Offline


Registered: 01/04/16
Posts: 728
Loc: NC
I am using Pennzoil 0w40 in 2009 Scion xB that specs 0w20. Engine is nice and smooth, definitely smoother than 0w20. Fuel economy is the same on both viscosities.
_________________________
Thicker oils give protection for severe operations such as driving in mountains, pulling a boat, dusty conditions, short trips, high rpm, overloading, overheating and overcooling. Thin oils give MPG.

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#4499835 - 08/27/17 09:23 PM Re: Running 0w40 or 5w40 [Re: Camprunner]
4WD Online   confused


Registered: 09/21/10
Posts: 6390
Loc: Texas
Mobil 1-FM 5w40 in ecoboost & Delvac 15w40 in 5.3L ... both tested quieter than 5w30 ... don't notice any other difference

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#4499843 - 08/27/17 09:33 PM Re: Running 0w40 or 5w40 [Re: 4WD]
bigj_16 Offline


Registered: 07/03/17
Posts: 1268
Loc: Douglas County, Colorado
Originally Posted By: 4WD
Mobil 1-FM 5w40 in ecoboost & Delvac 15w40 in 5.3L ... both tested quieter than 5w30 ... don't notice any other difference

"FM"?

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