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#4635808 - 01/15/18 02:00 PM Mobil 1 5W-30 vs 0W-30 AFE
ZraHamilton Offline


Registered: 01/15/18
Posts: 92
Loc: Tennessee, United States
I am trying to determine which is better for cold winter start-ups.
The viscosity of the 5W-30 is actually 1 cSt thinner at 40C.

Mobil 1 5W-30 - @40C - 61.7 cSt
Mobil 1 AFE 0W-30 - @40C - 62.9 cSt

However, that is at 104F, and I would like to know how they compare at around 32F (0C).

Thanks to anyone who can help.

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#4635814 - 01/15/18 02:05 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
Shannow Offline


Registered: 12/12/02
Posts: 39846
Loc: 'Stralia
At 0C, there's literally absolutely nothing between those two oils.

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#4635849 - 01/15/18 02:45 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
ZraHamilton Offline


Registered: 01/15/18
Posts: 92
Loc: Tennessee, United States
Would there be any difference at -18C?

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#4635867 - 01/15/18 03:07 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
Rolla07 Offline


Registered: 11/05/11
Posts: 4734
Loc: MTL, CANADA
If your car recommends 5w30, I would just use the 0w30. Even if barely a difference between the two. Same price for the oil, and my experience has been that AFE always runs smoothly in my car. Either will work but I like to think the 0w will be easier on my engine during any cold starts. Even if no difference, what have i lost in ability vs using 5w30?
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4635871 - 01/15/18 03:15 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
ZraHamilton Offline


Registered: 01/15/18
Posts: 92
Loc: Tennessee, United States
Thanks for the advice Rolla07. Most of my driving is 10 minute trips, so I want an oil that will heat up as quickly as possible.

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#4635872 - 01/15/18 03:16 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
Bxnanaz Offline


Registered: 11/28/17
Posts: 86
Loc: SC, USA
I like 0Ws not only for cold starts but also the higher viscosity index.

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#4635880 - 01/15/18 03:26 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
ZraHamilton Offline


Registered: 01/15/18
Posts: 92
Loc: Tennessee, United States
Agreed. I've also heard that Mobil 1's AFE oils have a high percentage of PAOs in them. This means that it could be achieving the higher viscosity index with little to no viscosity index improvers.

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#4635889 - 01/15/18 03:33 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1705
Loc: Alberta
Here are is the definition under ASTM D5293 for cold cranking.

Cold Crank Viscosity

ASTM D5293- Test Method for Apparent Viscosity of Engine Oils Between -5 and -35 C Using the Cold Crank Simulator

This test method covers the laboratory determination of apparent viscosity of engine oils at temperatures between 5 and -35C and at high shear rates. The results are related to engine cranking characteristics of engine oil. A measured amount of sample is subjected to an extreme low temperature for 3 minutes. The rotor spins for 1 minute in the sample and the speed of the rotor is measured by keeping ohms resistance at zero. The speed-reading is used to determine the viscosity on a calibration curve.



The cold cranking simulator (CCS), ASTM D5293, correlates with engine cranking speed at low temperatures.





Cold cranking viscosity simulates the viscosity of an oil in crankshaft bearings during cold temperature start up.



Cold cranking viscosity limits, determined by the CCS, are defined in the SAE J300 Standard, as shown below:







Cold Crank Viscosity
Low temperature viscosity (mPa s) Max (CCS) Temps are degrees C.
0W 6200 @ -35
5W 6600 @ -30
10W 7000 @ -25
15W 7000 @ -20
20W 9500 @ -15
25W 13000 @ -10




Edited by Snagglefoot (01/15/18 03:48 PM)

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#4635900 - 01/15/18 03:47 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1705
Loc: Alberta
Originally Posted By: ZraHamilton
I am trying to determine which is better for cold winter start-ups.
The viscosity of the 5W-30 is actually 1 cSt thinner at 40C.

Mobil 1 5W-30 - @40C - 61.7 cSt
Mobil 1 AFE 0W-30 - @40C - 62.9 cSt

However, that is at 104F, and I would like to know how they compare at around 32F (0C).

Thanks to anyone who can help.


At -40 F/C, the results are fairly dramatic and you can make yourself a You Tube video to show everyone. At higher temps the difference is less dramatic. 0W-30 at -35 C flows like 5W-30 at -30 C which flows like 10W-30 at -25 C. I've personally done flow tests at -20 C and I can say you'll notice the difference between 5W-30 and 10W-30, but it is not dramatic like at -40. And yes, you probably wouldn't notice a difference between 0W-30 and 5W-30 at 0 degrees C.

SF


Edited by Snagglefoot (01/15/18 03:59 PM)

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#4635908 - 01/15/18 03:58 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
madeej11 Offline


Registered: 06/22/15
Posts: 109
Loc: montreal ,canada
The difference between the two of those oils are negligible at 32F. The 0w30 would pay dividends at roughly -20F which you would hardly ever see in Tennessee. JMO. Good luck.

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#4635968 - 01/15/18 05:13 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: Rolla07]
Shannow Offline


Registered: 12/12/02
Posts: 39846
Loc: 'Stralia
Originally Posted By: Rolla07
Either will work but I like to think the 0w will be easier on my engine during any cold starts.


see, that's the problem with the laws of physics...they don't really mind what people like to think.

at 32F, if anything has a slight edge it will be the marginally thinner 5W30.

As to what you've lost
Dexos
HTO-06
lighter basestocks with more "fillers'

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#4635974 - 01/15/18 05:17 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
CT8 Offline


Registered: 10/09/14
Posts: 10930
Loc: Idaho
The oil viscosity choice will not matter as far as cold starting until you start to ge below -25 *f.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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#4635994 - 01/15/18 05:38 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: ZraHamilton]
Astro_Guy Offline


Registered: 07/30/15
Posts: 444
Loc: Pennsylvania
_________________________
'01 Volvo V70XC, 224k, 0w40 M1
'16 Accord, 10k, soon to be 0w20 M1 EP

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#4636002 - 01/15/18 05:49 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: Astro_Guy]
OVERKILL Offline


Registered: 04/28/08
Posts: 36426
Loc: Ontario, Canada
Originally Posted By: Astro_Guy


That's not accurate below 0C.

Viscosity measured via CCS and MRV roughly halves as you increase temperature by 5C. So a 0w-30 with a CCS of 5,600cP @ -35C would be roughly 2,800cP @ -30C.

However, the issue is that if you are comparing say a 5w-30 and a 0w-30, at somewhere around -15C, that trick stops working and we start heading toward what you'd see in the calculator. Basically, that's where an oil's VI starts to become relevant. It's not a hard line, as it would vary based on base oil, PPD's, VII treatment....etc but it seems to be somewhere in that neighbourhood.

So we have this range between -15C and 0C where the visc calc isn't accurate and the halving rule isn't either.
_________________________
2016 Durango Limited
2016 Grand Cherokee SRT

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#4636078 - 01/15/18 06:54 PM Re: Mobil 1 5W-30 vs 0W-30 AFE [Re: Bxnanaz]
CT8 Offline


Registered: 10/09/14
Posts: 10930
Loc: Idaho
Originally Posted By: Bxnanaz
I like 0Ws not only for cold starts but also the higher viscosity index.
Higher Vi in a finished oil is usually due to more viscosity improvers used. Although I like the 0w- oils myself 1 oil from -35*f to over 100*f.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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