Recent Topics
Best bbq in tn?
by ram_man
Yesterday at 11:57 PM
Oil for new car
by massparanoia
Yesterday at 11:22 PM
Mixing Mobil 1 High Mileage with Mobil 1 AFE?
by lukejo
Yesterday at 11:21 PM
Beware of energy guide label inconsistencies; 2014
by JHZR2
Yesterday at 11:14 PM
funny website
by friendly_jacek
Yesterday at 10:43 PM
120K Mile 6G74 - Mobil 1 or Shell Ultra?
by Spetz
Yesterday at 09:54 PM
My evening OCI tonight in photos
by volk06
Yesterday at 09:22 PM
Push Mowers won't start/run--advice?
by lukejo
Yesterday at 09:12 PM
1/4" Drive Cordless Electric Ratchet
by john_pifer
Yesterday at 09:10 PM
A switch to SOPUS
by volk06
Yesterday at 09:00 PM
Recycling scrap engine parts
by oilboy123
Yesterday at 08:46 PM
Shower Diverter Valve Stem Replacement
by Finz
Yesterday at 08:30 PM
Newest Members
Trashman, massparanoia, Tdog02, Helliar, jrmitch
51147 Registered Users
Who's Online
30 registered (chriscreags, AMC, carlprop, babbittd, daves87rs, 808Soldier, 1 invisible), 753 Guests and 207 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51147 Members
64 Forums
218557 Topics
3446261 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Topic Options
#3247387 - 01/13/14 07:10 PM 5w-30 shear toward 5w-20s
Errtt Offline


Registered: 11/14/10
Posts: 2119
Loc: California
Did a little reading at work today about some 5w-30s shear down close to 5w-20. So if a car specs 5w-20 recommended, but 5w-30 can be used (higher temps etc), why not just go and stick with 5w-30 if it shears toward 5w-20 since 5w-20 is the most recommended if it specs for it.

Thinking in terms of GDI & dilution - specs 5w-20 and dilution compared to 5w-30 and dilution.

Top
#3247402 - 01/13/14 07:22 PM Re: 5w-30 shear toward 5w-20s [Re: Errtt]
AP9 Offline


Registered: 07/10/13
Posts: 214
Loc: Chicago suburbs
That's what I would do, but that's just me. Better a little too thick than a little too thin.

Top
#3247408 - 01/13/14 07:26 PM Re: 5w-30 shear toward 5w-20s [Re: Errtt]
Eddie Offline


Registered: 12/07/03
Posts: 6657
Loc: Florida, Cape Coral
I wonder if we know what oil-engine combinations, that holds true for? Would not the company engineers know that when making their oil change recommendations? One thing I do know from my owners manual is that 0w20 in a recommendation in USA & Canada only and 5w30 elsewhere. Ed
_________________________
CX5 Touring 2.5L :-)

Top
#3247429 - 01/13/14 07:48 PM Re: 5w-30 shear toward 5w-20s [Re: Errtt]
friendly_jacek Offline


Registered: 05/04/03
Posts: 5211
Loc: southeast US
Yap, going from 5W30 to 5W20 is very similar to Dexron III to VI transition. Should be backward compatible in most (but not all) applications.

Top
#3247488 - 01/13/14 08:40 PM Re: 5w-30 shear toward 5w-20s [Re: Errtt]
brandini Offline


Registered: 10/08/09
Posts: 961
Loc: Richmond, VA
Not all cars shear and not at 5w-30s shear, so grain of salt on those broad generalizations.
_________________________
07 Mazda3s Hatch - ZoomZoom - Using EAO-ALM-BF3-MTG-ANT-ATF

Top
#3247500 - 01/13/14 08:52 PM Re: 5w-30 shear toward 5w-20s [Re: Errtt]
Shannow Online   content


Registered: 12/12/02
Posts: 26327
Loc: a prison island
"some" is the operational word there.

I had a mess with some charts and numbers a few days ago...

http://www.bobistheoilguy.com/forums/ubb...ngs#Post3243503

Top