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#3354389 - 04/27/14 06:24 AM Observation: M1 0W-40 In 5W-30 Application
Oil Changer Offline


Registered: 08/28/06
Posts: 1413
Loc: Detroit Metro
1999 Chevy Express van, low miles, perfectly maintained, 5.7L. OM recommends 10W-30 for 0F and up, 5W-30 for all temps, severe cold, synthetic 5W-30 or 0W-30.

1. Oil pressure is instantaneous even with the few just above freezing morning temperatures I've had here. I expected higher pressure readings both cold and hot but the gauge reads the same.

2. Fuel economy went UP from 13.5 MPG to 16.6 MPG. My station could have switched from winter blend to summer but have not confirmed nor do I think the attendant would even know.

3. No loss of power, strange noises or other maladies I read here on BITOG that might happen.

Why? Because I had a gift card and it didn't cost me anything so I figure I would drain it if there was problems. Also, for pretty much every application that calls for a 5W-30 in NA, the M1 site recommends 0w-40 (which is named "Protection Formula") in Europe, including my van. I will leave it in for my typical interval. That means I will drain it in late October.

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#3354392 - 04/27/14 06:30 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
pbm Offline


Registered: 04/19/04
Posts: 5254
Loc: New York
Mobil 1 0w40 has more manufacturer approvals and is reputed to be one of Mobil's best oils. I would have no problem using it in your application and I would probably go a little further on the OCI.

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#3354400 - 04/27/14 06:54 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
Trav Offline


Registered: 11/20/06
Posts: 9987
Loc: MA, Mittelfranken.de
Originally Posted By: Oil Changer
No loss of power, strange noises or other maladies I read here on BITOG that might happen.

Why would there be? 0w40 is spec for most GM in some other countries. 0w40 is a lot thinner cold than some of the old dino 10w30 that was spec for the SBC years ago.
I remember in the early 70's some 10w30 was even hard to pour out of the can in winter, some didn't flow and blew a lot of engines if they were unfortunate enough to get it running.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

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#3354402 - 04/27/14 06:58 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
wemay Offline


Registered: 04/04/12
Posts: 2202
Loc: sun & rain, S. FL.
The viscosity specs for my Hyundai are 5w30 or 10w30. M1 actually recommends AFE 0w30, which is currently being used as of yesterday. I'll get back to you with any observations.
_________________________
14 Hyundai Sonata GLS 2.4L - 0w20 NAPA - OEM - <7500 mi
13 Hyundai Santa Fe Sp 2.0T - 5w40 Kendall - TF2808 - <4800 mi

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#3354404 - 04/27/14 07:03 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
Quattro Pete Offline


Registered: 10/30/02
Posts: 25927
Loc: Michigan
Originally Posted By: Oil Changer
2. Fuel economy went UP from 13.5 MPG to 16.6 MPG.

Sorry, but that is just not happening as a result of switching from 5w-30 to 0w-40.

I don't question that your fuel economy went up. It just had nothing to do with the oil.
_________________________
'02 530i (PU 5W-40)
'08 C300 4Matic (M1 0W-40)
'13 F700 GS (BMW HP 15W-50)

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#3354407 - 04/27/14 07:08 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Quattro Pete]
Merkava_4 Online   content


Registered: 01/30/07
Posts: 9390
Loc: Clovis, CA
Originally Posted By: Quattro Pete
Originally Posted By: Oil Changer
2. Fuel economy went UP from 13.5 MPG to 16.6 MPG.

Sorry, but that is just not happening as a result of switching from 5w-30 to 0w-40.


Why not ? Maybe the 40 weight is lubricating better thus reducing friction. In the UOA section, those Chevy truck V8's always have high wear numbers with 5W-30. On 40 weights, the numbers are always way lower.

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#3354412 - 04/27/14 07:15 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Merkava_4]
Quattro Pete Offline


Registered: 10/30/02
Posts: 25927
Loc: Michigan
Originally Posted By: Merkava_4
Why not ? Maybe the 40 weight is lubricating better thus reducing friction.

What is it about the 40-grade oil that is causing it to lubricate better? 40-grade oil has a higher film strength to offer more protection in extreme operating conditions, but that comes at a cost of INCREASED friction - engine is spending more effort on pushing heavier oil around. Granted, these are very miniscule changes, but they are typically changes towards worse fuel economy, not better. Unless the OP was using 20w-50 previously...

Notice, he described a 23% improvement in fuel economy.

Someone should alert GM ASAP - they could be beating their CAFE numbers just by doing away with dexos and recommending 40-grade oils instead.
_________________________
'02 530i (PU 5W-40)
'08 C300 4Matic (M1 0W-40)
'13 F700 GS (BMW HP 15W-50)

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#3354414 - 04/27/14 07:22 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Quattro Pete]
Oil Changer Offline


Registered: 08/28/06
Posts: 1413
Loc: Detroit Metro
Agreed. If I was to make a point that point would be don't expect drastic fuel economy losses by upping a grade. The only meaningful change made besides the oil is that I'm idling less in the warmer temperatures. Other than that, no changes, which is why I mentioned the fuel blending. I always see MPG improvements when the stations stop selling the oxygenated winter fuel.

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#3354416 - 04/27/14 07:23 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
Quattro Pete Offline


Registered: 10/30/02
Posts: 25927
Loc: Michigan
Originally Posted By: Oil Changer
The only meaningful change made besides the oil is that I'm idling less in the warmer temperatures.

That right there explains your change in MPG.
_________________________
'02 530i (PU 5W-40)
'08 C300 4Matic (M1 0W-40)
'13 F700 GS (BMW HP 15W-50)

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#3354421 - 04/27/14 07:31 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
Colt45ws Offline


Registered: 08/15/06
Posts: 7459
Loc: Central Washington
Yup. I would expect that engine to consume in the neighborhood of 0.5-0.7GPH idling when warmed up. More cold.


Edited by Colt45ws (04/27/14 07:32 AM)
_________________________
-Colton
2004 Ford Crown Vic LX, 81k "Tank"
2002 Ford Crown Vic PI, 162k "Highwayman" (Ex-Kootenai County, ID Unit #42)

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#3354433 - 04/27/14 07:54 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
Oil Changer Offline


Registered: 08/28/06
Posts: 1413
Loc: Detroit Metro
The oil I had in all winter was PP 5W-30.

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#3354435 - 04/27/14 07:55 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
spk2000 Offline


Registered: 02/19/13
Posts: 276
Loc: Brownsburg, IN
I also noted that when I changed from Mobil1 5w30 to their High mileage blend that was 10W40 my fuel economy increased tremendously. It went from 24 mpg to 28. This was consistent and stayed that way until I sold the car. It was a 98 mercury sable with the duratec engine. I sold it with 240,000 miles on it and it still ran good but the body was deteriorating and showing wear.
_________________________
96 Grand Marquis miles-Amsoil 10W40, M1 Filter
01 Sable LS miles-M1 0W20, M1 Filter
02 Montero miles-PU 5W30, M1 Filter
Sean

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#3354440 - 04/27/14 08:01 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
Oil Changer Offline


Registered: 08/28/06
Posts: 1413
Loc: Detroit Metro
With the brutally cold winter we had, I was idling as long as 30 minutes before driving off. Now it's get in, strap in, and go. Recently, I've had overnight lows in the 20's but it's been just above freezing when I leave. I was expecting higher pressures, sluggishness, and a drop in MPG. I'm not seeing any of that with the 0W-40.

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#3354441 - 04/27/14 08:03 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Oil Changer]
buster Offline


Registered: 11/16/02
Posts: 29201
Loc: NJ
I put M1 0w40 in my 03 Foreter and it's the best oil I've used yet in terms of keeping the engine quiet. It runs great on this grade.
_________________________
2014 Mazda 3 S GT AT - OE oil
2003 Forester XS 5spd - M1 0w40

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#3354450 - 04/27/14 08:15 AM Re: Observation: M1 0W-40 In 5W-30 Application [Re: Quattro Pete]
demarpaint Offline


Registered: 07/03/05
Posts: 21341
Loc: NY
Originally Posted By: Quattro Pete
Originally Posted By: Oil Changer
The only meaningful change made besides the oil is that I'm idling less in the warmer temperatures.

That right there explains your change in MPG.


Big time, and the rise in temps.
_________________________
GOD Bless our Troops


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