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#4639597 - 01/19/18 07:10 AM 5w30 & 10w30
Camprunner Offline

Registered: 02/19/08
Posts: 970
Loc: MA.
Is there any proof from UOA that a 10w30 will shear less under hard use then a 5w30? The 10w30 having less viscosity improvers.

#4639712 - 01/19/18 09:11 AM Re: 5w30 & 10w30 [Re: Camprunner]
csandste Offline

Registered: 05/31/02
Posts: 1056
Loc: St. Peters, Missouri
Twenty years ago, certainly.

#4639722 - 01/19/18 09:22 AM Re: 5w30 & 10w30 [Re: Camprunner]
TiredTrucker Offline

Registered: 01/04/08
Posts: 3209
Loc: Central Iowa
Can't speak from a gasoline perspective, but I know from my commercial UOA's that 10w30 shows less viscosity change than 15w40 in my diesels. And to the OP's point, 15w40 uses more VI than 10w30. That is comparing two of the same brand name products, both syn blends. I have not really compared 5w30 to 10w30 on that level.
Freedom is not about having the choice to do what you want, but the choice to do what you ought.

#4639745 - 01/19/18 09:47 AM Re: 5w30 & 10w30 [Re: TiredTrucker]
Bryanccfshr Offline

Registered: 10/09/04
Posts: 5626
Loc: Durango, Co
15w30 for best effect.

Ilsac oils are more similar than not.
2017 Trd Pro 4Runner
2018 Trd Pro 4Runner 0w20 winter, 5-10w30 summer.
2012 BMW 328i Castrol 0w40
2007 f150 4.6 4x4 Motorcraft 5w20

#4639901 - 01/19/18 12:28 PM Re: 5w30 & 10w30 [Re: Camprunner]
ZraHamilton Offline

Registered: 01/15/18
Posts: 79
Loc: Tennessee, United States
That depends on the viscosity index of the base oil. The higher the viscosity index of the base oil, the less viscosity index improvers it will need.

#4639931 - 01/19/18 01:08 PM Re: 5w30 & 10w30 [Re: Camprunner]
burla Offline

Registered: 11/07/16
Posts: 156
Loc: sonoma
If you live in a warm enough state, just use the 10w30, it is very likely to have less or no Vii's. Dave from redline has gone on the record their 10w30 and 5w20 have no Vii's.

#4644593 - 01/24/18 03:17 AM Re: 5w30 & 10w30 [Re: Camprunner]
Garak Offline

Registered: 12/05/09
Posts: 23725
Loc: Regina, Saskatchewan, Canada
I still say if a 5w-30 ILSAC is a perceived problem, a 10w-30 ILSAC is hardly the solution.
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515