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#4537519 - 10/08/17 08:57 PM I'm confused about the "cold" oil viscosity rating
Avery4 Offline


Registered: 01/29/14
Posts: 270
Loc: USA
I am confused about why, for example, a 30w oil is available when a 10w30 or 5w30 would apparently work just as well when hot and work much better while cold. Would there be a disadvantage to using 0w30 in hot weather instead of SAE 30?


Edited by Avery4 (10/08/17 09:00 PM)

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#4537522 - 10/08/17 09:03 PM Re: I'm confused about the "cold" oil viscosity rating [Re: Avery4]
TmanP Offline


Registered: 10/30/15
Posts: 436
Loc: MN
As I understand it, the SAE 30 is more resistant to breaking down in heat (due to the lack of viscosity improvers, which are only good for so long). So, while 5w30 is fine in summer, the ranking is probably
SAE 30>10w30>5w30 (for hot weather). This is why you will see SAE 30 used in lawn mowers. But, practically, there isn't too much difference and 0w30/5w30 can be used year-round.
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#4537523 - 10/08/17 09:04 PM Re: I'm confused about the "cold" oil viscosity rating [Re: Avery4]
OVERKILL Offline


Registered: 04/28/08
Posts: 36451
Loc: Ontario, Canada
An SAE 30 will have no VII (Viscosity Index Improvers) in it, which would make it immune to mechanical shear. However, generally your premise is correct in that there would be little advantage to using an SAE 30 over any of the grades you've mentioned.

Also, there are oils like Amsoil's 10w-30 that have no VII's in them and can also be labelled an SAE 30, muddying things further.
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#4537540 - 10/08/17 09:29 PM Re: I'm confused about the "cold" oil viscosity rating [Re: Avery4]
5AcresAndAFool Online   content


Registered: 12/18/16
Posts: 421
Loc: Indiana
Ive always wondered if you had a situation where a vehicle was run around the clock most of the time, such as vehicles serving police, taxi, or ambulance duty, if you would be better off using a straight 30 weight oil.

How many miles on average before you see viscosity breaking down?

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#4537543 - 10/08/17 09:33 PM Re: I'm confused about the "cold" oil viscosity rating [Re: 5AcresAndAFool]
OVERKILL Offline


Registered: 04/28/08
Posts: 36451
Loc: Ontario, Canada
Originally Posted By: 5AcresAndAFool
Ive always wondered if you had a situation where a vehicle was run around the clock most of the time, such as vehicles serving police, taxi, or ambulance duty, if you would be better off using a straight 30 weight oil.

How many miles on average before you see viscosity breaking down?


If you look at oils designed for extended drain intervals like M1 0w-40, GC 0w-40...etc which are also a broad split on the visc side, it's easy to conclude that the straight weight may not offer any inherent advantage in that department. Where they do shine are in applications of high shear or where low cost is required, as they are cheap to blend, unlike a synthetic extended drain Euro oil.
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#4537570 - 10/08/17 10:19 PM Re: I'm confused about the "cold" oil viscosity rating [Re: Avery4]
jj51702 Offline


Registered: 10/07/16
Posts: 232
Loc: California
Probably cause there is a market for it

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#4537598 - 10/08/17 11:14 PM Re: I'm confused about the "cold" oil viscosity rating [Re: 5AcresAndAFool]
zeng Offline


Registered: 09/01/15
Posts: 2188
Loc: Malaysia
Originally Posted By: 5AcresAndAFool
How many miles on average before you see viscosity breaking down?

As low as several hundreds of miles of a multigrade in use.
Often times, it stays sheared-thin at the end of OCI of 5-10k.

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#4537600 - 10/08/17 11:18 PM Re: I'm confused about the "cold" oil viscosity rating [Re: Avery4]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
People are afraid of SAE 30 although it's one tough Hombre.
It costs more too since it only comes in quart bottles.

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#4537625 - 10/09/17 01:08 AM Re: I'm confused about the "cold" oil viscosity rating [Re: Avery4]
koffy Offline


Registered: 01/24/15
Posts: 127
Loc: Around the corner
SO, volatility does not mean anything?

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#4537647 - 10/09/17 04:06 AM Re: I'm confused about the "cold" oil viscosity rating [Re: Avery4]
OhOMG Offline


Registered: 09/11/17
Posts: 74
Loc: On your screen
Originally Posted By: Avery4
I am confused about why, for example, a 30w oil is available when a 10w30 or 5w30 would apparently work just as well when hot and work much better while cold. Would there be a disadvantage to using 0w30 in hot weather instead of SAE 30?


Generally, the answer to this question is no, there is no disadvantage to using the 0w30 in hot weather versus a 30-grade and yes you could use the 0W-30 year round.

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#4537648 - 10/09/17 04:29 AM Re: I'm confused about the "cold" oil viscosity rating [Re: OhOMG]
Shannow Online   content


Registered: 12/12/02
Posts: 39863
Loc: 'Stralia
Originally Posted By: OhOMG
Originally Posted By: Avery4
I am confused about why, for example, a 30w oil is available when a 10w30 or 5w30 would apparently work just as well when hot and work much better while cold. Would there be a disadvantage to using 0w30 in hot weather instead of SAE 30?


Generally, the answer to this question is no, there is no disadvantage to using the 0w30 in hot weather versus a 30-grade and yes you could use the 0W-30 year round.


No disadvanteages ?
* Higher NOACK
* More VII to shear down in service
* Lower HTHS

a 20W20 would do...

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#4537662 - 10/09/17 06:07 AM Re: I'm confused about the "cold" oil viscosity rating [Re: OhOMG]
Ducked Offline


Registered: 10/25/12
Posts: 4360
Loc: Taiwan
Originally Posted By: OhOMG
Originally Posted By: Avery4
I am confused about why, for example, a 30w oil is available when a 10w30 or 5w30 would apparently work just as well when hot and work much better while cold. Would there be a disadvantage to using 0w30 in hot weather instead of SAE 30?


Generally, the answer to this question is no, there is no disadvantage to using the 0w30 in hot weather versus a 30-grade and yes you could use the 0W-30 year round.


According to my handbook, I could use an SAE30 year-round, but I can't get it.

So I use an SAE40 year-round

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#4537709 - 10/09/17 07:13 AM Re: I'm confused about the "cold" oil viscosity rating [Re: Merkava_4]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: Merkava_4

It costs more too since it only comes in quart bottles.


What?!?!?!

Go to a farm or truck supply store....
1 gallon, 5 gallon, 30 gallon, 55 gallon are all READILY available.
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#4537718 - 10/09/17 07:24 AM Re: I'm confused about the "cold" oil viscosity rating [Re: Linctex]
4WD Offline


Registered: 09/21/10
Posts: 6374
Loc: Texas
Yep = One of the common “tax free” lubes around here ...

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#4537740 - 10/09/17 08:04 AM Re: I'm confused about the "cold" oil viscosity rating [Re: Ducked]
Chris142 Offline


Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
Originally Posted By: Ducked
Originally Posted By: OhOMG
Originally Posted By: Avery4
I am confused about why, for example, a 30w oil is available when a 10w30 or 5w30 would apparently work just as well when hot and work much better while cold. Would there be a disadvantage to using 0w30 in hot weather instead of SAE 30?


Generally, the answer to this question is no, there is no disadvantage to using the 0w30 in hot weather versus a 30-grade and yes you could use the 0W-30 year round.


According to my handbook, I could use an SAE30 year-round, but I can't get it.

So I use an SAE40 year-round
no 30wt?
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