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

Registered: 11/14/10
Posts: 2334
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: 255
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) - QSUD 5W-30/MC FL1A
1996 Chevrolet Impala SS - M1 0W-40/M1-201

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

Registered: 12/07/03
Posts: 7648
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: 6404
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 Offline

Registered: 10/08/09
Posts: 1154
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: 30918
Loc: Oz
"some" is the operational word there.

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