Recent Topics
Help Locating GL-4 Tranny Gear Lube
by s1mp13m4n
33 minutes 10 seconds ago
104 ton (metric) road train starts test period
by Nebroch
52 minutes 5 seconds ago
$10 off all $50 gas cards Thurs-Sun at Publix
by Mr Nice
Today at 05:58 AM
Tire psi planted versus lifted
by mjoekingz28
Today at 04:39 AM
Raise front end or not
by mjoekingz28
Today at 04:38 AM
5-Qt Quaker State Full Synthetic Motor Oil $12
by morpheus6d9
Today at 01:50 AM
Text Formatting Question
Today at 01:24 AM
Honda's Power Exporter
Today at 01:09 AM
RYCO Z411 & Z411HE Cut open (Australia)
by Borgmage
Today at 12:58 AM
which is the "best" oil.........
by Luisraul924
Yesterday at 11:53 PM
General Altimax Artic Studded
by Grambo
Yesterday at 11:48 PM
QSUD And A Driveworks Filter For $19.99
by crazyoildude
Yesterday at 11:26 PM
Newest Members
Borgmage, Chewie, ZTime33, Fat_boy, ntaphse
55628 Registered Users
Who's Online
76 registered (285south, austinhyd, Andrei, aquariuscsm, Al, 2009Edge, 8 invisible), 934 Guests and 137 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
55628 Members
66 Forums
238748 Topics
3855590 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: 2320
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.

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

Registered: 07/10/13
Posts: 250
Loc: Chicago suburbs
That's what I would do, but that's just me. Better a little too thick than a little too thin.
2000 Ford Explorer XLT 4WD (4.0L OHV V6)
1996 Chevrolet Impala SS

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

Registered: 12/07/03
Posts: 7550
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 :-)

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

Registered: 05/04/03
Posts: 6303
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.

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

Registered: 10/08/09
Posts: 1153
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

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

Registered: 12/12/02
Posts: 30304
Loc: Oz
"some" is the operational word there.

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