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#2020606 - 09/18/10 01:53 PM Any reason not to use 5w-30 in place of 10w-30?
The_Eric Offline


Registered: 03/31/10
Posts: 4613
Loc: Iowa
The other day, I was working on the boss to convert back to bulk oil, (from cases of quarts) citing environmental concerns and convenience. We briefly discussed what we'd stock and I suggested just having 5w-20 and 5w-30 in drums. Is there any concern using 5w-30 in place of a 10w-30? With today's modern base stocks and additive packages, I can't see why a 5w-30 wouldn't hold up in place of a 10w-30...

FWIW, the oil in question would be Kendall GT-1 Synthetic blend with the Liquid Titanium.
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2001 Hyundai Elantra 2.0
1998 Chevy Malibu 2.4
1995 Pontiac Grand Am 3.1
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#2020609 - 09/18/10 01:58 PM Re: Any reason not to use 5w-30 in place of 10w-30? [Re: The_Eric]
Spyder7 Offline


Registered: 07/28/10
Posts: 2269
Loc: NL, Canada
In Iowa 5W30 would be fine year round for any car using 10W30. I prefer 10W30 for mine, though 5W30 is fine for fall and winter, but that's only because it burns oil and the 10W30s I have are more resistant to burn off than their 5W30 counterparts (not due to thickness as both are the same at operating temp).

-Spyder
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#2020610 - 09/18/10 01:59 PM Re: Any reason not to use 5w-30 in place of 10w-30? [Re: The_Eric]
sangyup81 Offline


Registered: 10/24/09
Posts: 1649
Loc: Bowie, MD
I don't know about completely replacing 10w-30 since some customers may insist on it. Perhaps keep some in quart cases?

Practically, 10w-30 is better in cases where shear is a concern and for some direct injection applications but for the most part, 5w-30 shouldn't be a problem.

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#2020611 - 09/18/10 01:59 PM Re: Any reason not to use 5w-30 in place of 10w-30? [Re: The_Eric]
Drew99GT Offline


Registered: 10/11/02
Posts: 21450
Loc: Colorado Springs
If you look at NOACK limits for SM/GF-4 compared to previous specs just a few years back (SH/GF-2), modern 5w-30 conventional oils would far surpass a 10w-30 of yesteryear. Given you'd be using The Kendall blend, I'd have no problem doing what you want to do. I bet the cost savings alone would be justifiable.


Edited by Drew99GT (09/18/10 02:00 PM)

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#2020669 - 09/18/10 03:41 PM Re: Any reason not to use 5w-30 in place of 10w-30? [Re: The_Eric]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
I'd also go with the 5-30 instead.
10-30 is kinda obsolete.
Oils are tougher and more well built now. Shearing is rarely a real life concern.

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#2020697 - 09/18/10 04:11 PM Re: Any reason not to use 5w-30 in place of 10w-30? [Re: The_Eric]
The_Eric Offline


Registered: 03/31/10
Posts: 4613
Loc: Iowa
Great, thanks for your input! It more or less confirm my thoughts all along.

Now the tough part will be selling it to the boss. Granted it's not necessarily a bad thing, but if an oil cap calls for 10w-30 (like an older GM 3.8), then that's what goes in it unless it's winter time. Unless a customer asks for or supplies something different, it's strictly by the book/cap. The only thing is that some of those specs are outdated as many of you already know.


Edited by The_Eric (09/18/10 04:12 PM)
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#2020749 - 09/18/10 05:15 PM Re: Any reason not to use 5w-30 in place of 10w-30? [Re: mechtech2]
beast3300 Offline


Registered: 12/24/09
Posts: 3121
Loc: Ohio
Originally Posted By: mechtech2
I'd also go with the 5-30 instead.
10-30 is kinda obsolete.
Oils are tougher and more well built now. Shearing is rarely a real life concern.


agreed 100%
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#2020758 - 09/18/10 05:26 PM Re: Any reason not to use 5w-30 in place of 10w-30 [Re: The_Eric]
ItsuMitsubishi Offline


Registered: 06/14/10
Posts: 421
Loc: Ajax, ON
5w30 will hold up, but if you never even see freezing temps, what's the point? (Obviously not the pour point- flashpoint maybe) Unless you can be assured the 5w30 is formulated with a higher VI base stock than the 10w30, which can happen, why bother? Generally, I find most big oil blenders don't like to keep more basestock grades on hand than absolutely necessary, and 10w30 to be a more robust oil lacking only in VII content to it's 5w30 counterpart. There are a lot of old ways of thinking that are just obsolete these days, but honestly, 10w30 in warm climates is not one of them IMO.
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#2020812 - 09/18/10 06:46 PM Re: Any reason not to use 5w-30 in place of 10w-30 [Re: ItsuMitsubishi]
The_Eric Offline


Registered: 03/31/10
Posts: 4613
Loc: Iowa
Originally Posted By: ItsuMitsubishi
5w30 will hold up, but if you never even see freezing temps, what's the point? (Obviously not the pour point- flashpoint maybe) Unless you can be assured the 5w30 is formulated with a higher VI base stock than the 10w30, which can happen, why bother? Generally, I find most big oil blenders don't like to keep more basestock grades on hand than absolutely necessary, and 10w30 to be a more robust oil lacking only in VII content to it's 5w30 counterpart. There are a lot of old ways of thinking that are just obsolete these days, but honestly, 10w30 in warm climates is not one of them IMO.


First off, we definitely see freezing temps! Secondly, it'll be tough enough to get him to switch to 5w-30 for both applications, there's no way he'll go for 10w in a 5w application. I think he's one who doesn't know terribly much about oil, so 10w is thicker to him than 5w.
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#2020886 - 09/18/10 08:40 PM Re: Any reason not to use 5w-30 in place of 10w-30 [Re: The_Eric]
ItsuMitsubishi Offline


Registered: 06/14/10
Posts: 421
Loc: Ajax, ON
Originally Posted By: The_Eric
Originally Posted By: ItsuMitsubishi
5w30 will hold up, but if you never even see freezing temps, what's the point? (Obviously not the pour point- flashpoint maybe) Unless you can be assured the 5w30 is formulated with a higher VI base stock than the 10w30, which can happen, why bother? Generally, I find most big oil blenders don't like to keep more basestock grades on hand than absolutely necessary, and 10w30 to be a more robust oil lacking only in VII content to it's 5w30 counterpart. There are a lot of old ways of thinking that are just obsolete these days, but honestly, 10w30 in warm climates is not one of them IMO.


First off, we definitely see freezing temps! Secondly, it'll be tough enough to get him to switch to 5w-30 for both applications, there's no way he'll go for 10w in a 5w application. I think he's one who doesn't know terribly much about oil, so 10w is thicker to him than 5w.


Whoops, yeah I checked your locale after I posted that. I thought it was for California or something. Indeed 5w is certainly the grade for your bud :)
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#2020916 - 09/18/10 09:15 PM Re: Any reason not to use 5w-30 in place of 10w-30 [Re: The_Eric]
The_Eric Offline


Registered: 03/31/10
Posts: 4613
Loc: Iowa
Gotcha. Thanks for your input.
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1998 Chevy Malibu 2.4
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#2020945 - 09/18/10 09:59 PM Re: Any reason not to use 5w-30 in place of 10w-30 [Re: The_Eric]
HTSS_TR Online   content


Registered: 04/17/06
Posts: 17867
Loc: Lake Forest, CA
Any reason not to use 5w-30 in place of 10w-30 ?

Yes, the reason is Honda only specified 2 weights for S2000, for temp above 0F use only 10W30 and for temp below 0F use 5W40.

Why Honda recommend 5W40 in S2000, not 5W30, for temp below 0F is a mystery to me. For an engine that can rev to 9k RPM, 10W30 is more shear stable therefore it is recommended.
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#3060016 - 07/09/13 09:25 PM Re: Any reason not to use 5w-30 in place of 10w-30 [Re: HTSS_TR]
randomhero439 Offline


Registered: 07/21/12
Posts: 1270
Loc: ohio
Originally Posted By: HTSS_TR
Any reason not to use 5w-30 in place of 10w-30 ?

Yes, the reason is Honda only specified 2 weights for S2000, for temp above 0F use only 10W30 and for temp below 0F use 5W40.

Why Honda recommend 5W40 in S2000, not 5W30, for temp below 0F is a mystery to me. For an engine that can rev to 9k RPM, 10W30 is more shear stable therefore it is recommended.


Bump: Honda needs the car to perform and rev like crazy in sub 0* temps too! The car requires a shear stable oil at lower temps. 10w-30 is not adequate for cold temps. 5w-30 is not shear stable enough. So 5w-40 works with cold temps, shear stable since its synthetic and is thicker to deal with the fuel dilution that winter driving creates.

Smart decision Honda.
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#3060027 - 07/09/13 09:33 PM Re: Any reason not to use 5w-30 in place of 10w-30 [Re: The_Eric]
901Memphis Offline


Registered: 08/14/10
Posts: 10590
Loc: Northern Kentucky
Even since this thread was made in 2010 I'm sure 5w30s are even more shear resistant than before.
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#3060083 - 07/09/13 10:23 PM Re: Any reason not to use 5w-30 in place of 10w-30 [Re: 901Memphis]
randomhero439 Offline


Registered: 07/21/12
Posts: 1270
Loc: ohio
Originally Posted By: 901Memphis
Even since this thread was made in 2010 I'm sure 5w30s are even more shear resistant than before.


I agree, you could also argue that 5w-30 has come along way since the S2000 came out in 1999 wink
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