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5w30 & 10w30 #4639597
01/19/18 07:10 AM
01/19/18 07:10 AM
Joined: Feb 2008
Posts: 1,065
MA.
Camprunner Offline OP
Camprunner  Offline OP
Joined: Feb 2008
Posts: 1,065
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.

Re: 5w30 & 10w30 [Re: Camprunner] #4639712
01/19/18 09:11 AM
01/19/18 09:11 AM
Joined: May 2002
Posts: 1,529
St. Charles County, Missouri
csandste Offline
csandste  Offline
Joined: May 2002
Posts: 1,529
St. Charles County, Missouri
Twenty years ago, certainly.


2017 Kia Soul Plus-- VWB 5-30, 54,000 miles.
Re: 5w30 & 10w30 [Re: Camprunner] #4639722
01/19/18 09:22 AM
01/19/18 09:22 AM
Joined: Jan 2008
Posts: 3,332
Central Iowa
TiredTrucker Offline
TiredTrucker  Offline
Joined: Jan 2008
Posts: 3,332
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.
Re: 5w30 & 10w30 [Re: TiredTrucker] #4639745
01/19/18 09:47 AM
01/19/18 09:47 AM
Joined: Oct 2004
Posts: 5,803
Texas, Mentone for work, Galve...
Bryanccfshr Offline
Bryanccfshr  Offline
Joined: Oct 2004
Posts: 5,803
Texas, Mentone for work, Galve...
15w30 for best effect.

Ilsac oils are more similar than not.


2018 Trd Pro 4Runner M1 0w40
2018 Tacoma off-road Castrol 5w30 Magnatec
Re: 5w30 & 10w30 [Re: Camprunner] #4639901
01/19/18 12:28 PM
01/19/18 12:28 PM
Joined: Jan 2018
Posts: 108
Tennessee, United States
ZraHamilton Offline
ZraHamilton  Offline
Joined: Jan 2018
Posts: 108
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.

Re: 5w30 & 10w30 [Re: Camprunner] #4639931
01/19/18 01:08 PM
01/19/18 01:08 PM
Joined: Nov 2016
Posts: 430
sonoma
burla Offline
burla  Offline
Joined: Nov 2016
Posts: 430
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.

Re: 5w30 & 10w30 [Re: Camprunner] #4644593
01/24/18 03:17 AM
01/24/18 03:17 AM
Joined: Dec 2009
Posts: 26,241
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline
Joined: Dec 2009
Posts: 26,241
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

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