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#95668 - 08/10/04 09:46 AM 0W30 vs. 5W30 vs. 10W30
kickster Offline


Registered: 05/23/04
Posts: 300
Loc: toronto
what is the advantage of using a 5w30 or 10W30 over 0w30! since all 3 oils have same viscosity when they are hot then there is no point of using 10W or 5W!!!

Am I missing something here?

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#95669 - 08/09/04 10:00 PM Re: 0W30 vs. 5W30 vs. 10W30
Hubjeep Offline


Registered: 08/11/03
Posts: 91
Loc: Long Island, NY
Good question, will they perform the same in summer months?

-John [Cool]

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#95670 - 08/09/04 10:08 PM Re: 0W30 vs. 5W30 vs. 10W30
TallPaul Offline


Registered: 10/22/03
Posts: 13030
Loc: By Detroit
All else equal, the 0w30 will have the most viscosity index improvers (VIIs) and will be most prone to breakdown under hard use, especially in summer.

But all is not equal. In many cases it seems that as you look at the MSDSs for a brand, moving from 10w30 to 5w30 to 0w30 (if available), the base oil quality increases (base oil Group #).

For example, MSDSs show Valvoline Durablend 5w30 to have more of the hydrotreat (Group II-III) than Durablend 10w30. This apparently is to equalize the performance across the different multigrades.

If the higher group number has better cold propertied, then does a Group II 5w30 have as thick of a base oil as a Group I 10w30. I suspect not, but if it did, then the 5w30 would be the way to go. Maybe a Group IV 5w30 would. Wish there were a way to find out. Can't compare on cold crank or cold pumping viscosities as each different "w" number has a different temperature at which it is tested.

Possibly the 40C viscosity would give a hint at the differences in the base oil weight.l But this would not be very accurate.

[ August 10, 2004, 01:13 PM: Message edited by: TallPaul ]

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#95671 - 08/09/04 10:11 PM Re: 0W30 vs. 5W30 vs. 10W30
kickster Offline


Registered: 05/23/04
Posts: 300
Loc: toronto
Assuming all these oils are synthetic then the VI sheering should not be a factor!

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#95672 - 08/09/04 10:16 PM Re: 0W30 vs. 5W30 vs. 10W30
TallPaul Offline


Registered: 10/22/03
Posts: 13030
Loc: By Detroit
quote:
Originally posted by kickster:
Assuming all these oils are synthetic then the VI sheering should not be a factor!

Yeah. True. Though some synthetic oils do use VIIs, perhaps a 5w40 or 5w50. But most synthetics should be pretty sheer stable. If I could run a 5w40 that had no VIIs I might do it, but it probably would be the cost-prohibitive Redline oil.

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#95673 - 08/10/04 05:20 AM Re: 0W30 vs. 5W30 vs. 10W30
Patman Offline



Registered: 05/27/02
Posts: 19371
Loc: Oakville, Ontario
quote:
Originally posted by kickster:
Assuming all these oils are synthetic then the VI sheering should not be a factor!

Exactly, we've got GC 0w30 which shows itself not to thin out very easily, except perhaps in turbo applications. In my old LT1 Firebird it would actually thicken up instead of thin out.

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#95674 - 08/10/04 06:02 AM Re: 0W30 vs. 5W30 vs. 10W30
JohnnyG Offline


Registered: 01/01/03
Posts: 323
Loc: Ohio
OK then, what's the story on GC? Does it have a lot of VII's or not? Final answer?

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#95675 - 08/10/04 02:30 PM Re: 0W30 vs. 5W30 vs. 10W30
Patman Offline



Registered: 05/27/02
Posts: 19371
Loc: Oakville, Ontario
quote:
Originally posted by JohnnyG:
OK then, what's the story on GC? Does it have a lot of VII's or not? Final answer?

It appears that it uses very little, if any. Although it would be nice if we could get the full in depth voa on this stuff!

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#95676 - 08/10/04 04:59 PM Re: 0W30 vs. 5W30 vs. 10W30
elwaylite Offline


Registered: 06/09/04
Posts: 488
Loc: Theodore Al
quote:
Originally posted by Patman:
quote:
Originally posted by JohnnyG:
OK then, what's the story on GC? Does it have a lot of VII's or not? Final answer?

It appears that it uses very little, if any. Although it would be nice if we could get the full in depth voa on this stuff!
How much would it cost and how would you get that done?

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#95677 - 08/10/04 05:52 PM Re: 0W30 vs. 5W30 vs. 10W30
Patman Offline



Registered: 05/27/02
Posts: 19371
Loc: Oakville, Ontario
It's about $400, and Terry Dyson was talking about getting it done possibly.

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#95678 - 08/10/04 05:53 PM Re: 0W30 vs. 5W30 vs. 10W30
Ugly3 Offline


Registered: 08/06/04
Posts: 2635
Loc: Chicago
Given that you are in Toronto you don't see too many 100+ degree days. If these are dino oils I would go with 5w30, if synthetic I would go with 0w30.

Ideal would be 10w30 in the summer and 0w30 in the winter if the timing works out.

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#95679 - 08/10/04 06:08 PM Re: 0W30 vs. 5W30 vs. 10W30
jason07-1zzfe Offline


Registered: 06/10/02
Posts: 2095
Loc: IL
HTHS is more relevant that kinematic visc. And even then HTHS is not completely indicative of film thickness or shear resistance.

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#95680 - 08/12/04 05:20 AM Re: 0W30 vs. 5W30 vs. 10W30
JohnnyG Offline


Registered: 01/01/03
Posts: 323
Loc: Ohio
Maybe we could take up a collection to help defer the cost. What are we talking here, Gas Chromatograph or what? Oppps [Eek!] Another GC! Go figure.

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#95681 - 08/12/04 05:26 AM Re: 0W30 vs. 5W30 vs. 10W30
Logik Offline


Registered: 07/16/04
Posts: 92
Loc: Bay Area, CA
I drive a 2001 Acura Integra Type-R

All conditions equal, and changing the oil religiously every 3000 miles, which Mobil 1 weight would theoretically be best for the engine:

0w-30
5w-30
10w-30

The cap says run 5w-30 and I do-- what potential 0w-30 advantages would I have?

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#95682 - 08/12/04 05:46 AM Re: 0W30 vs. 5W30 vs. 10W30
mechtech Offline


Registered: 08/11/04
Posts: 2387
Loc: Chicago area
3000 m OCI with M1 is overkill - but I do the same thing - cheaper than a motor!
Go with the 0-30, and you'll get better start up wear/oil flow, in addition to the great warm/hot protection.

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