Recent Topics
Driving Waco to Springfield, MO
by user52165
03/21/18 12:40 AM
PP or PUP? Same price.
by RonRonnster
03/21/18 12:27 AM
Akebono vs Toyota OEM pads
by DrRoughneck
03/20/18 11:57 PM
80% Wear Startup Shouldn't MRV Be Most Important?
by Fallguy
03/20/18 10:24 PM
You've got hipsters
by SR5
03/20/18 09:36 PM
Why is oil at Walmart so cheap?
by Weezybabydoll
03/20/18 09:28 PM
2014 Jetta 4 year review
by gregk24
03/20/18 09:10 PM
o2 sensor anti seize
by spasm3
03/20/18 08:46 PM
Water pump OE or ?
by Ndx
03/20/18 08:41 PM
A good mechanics marketing scheme, perhaps?
by 92saturnsl2
03/20/18 08:23 PM
titanium additive in Kendall oils...
by Invasivore
03/20/18 08:21 PM
2006 F150 5.4L short trips
by db500
03/20/18 08:13 PM
Where is recent Pennzoil question and answer?
by mbacfp
03/20/18 08:07 PM
Versatrak rear diff groan?
by 55Test
03/20/18 07:58 PM
Sea Doo/Rotax 900 ACE oil capacity only 2 qts!!!
by tomcat27
03/20/18 07:53 PM
Wheel Horse tractor
by HM12460
03/20/18 07:17 PM
Anything wrong with rubber edge guards?
by NoNameJoe
03/20/18 07:05 PM
centric stop tech street
by spasm3
03/20/18 06:58 PM
Mobil 1 0w-40, 10.5k MI, '07 Infiniti G35x 3nd UOA
by cutlassvillager
03/20/18 06:33 PM
CVT Formulation for Multi-Vehicle CVT VOA
by MolaKule
03/20/18 06:03 PM
Newest Members
turbobooster, moparfreak13, turtmaster, hobitopia, rockyraj
64515 Registered Users
Who's Online
23 registered (ArrestMeRedZ, Aerojoe, B320i, BlakeB, AVB, 4 invisible), 790 Guests and 119 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
64515 Members
68 Forums
280160 Topics
4676506 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4536416 - 10/07/17 06:21 PM 2010 paper on extending viscosity grades <20
Shannow Offline

Registered: 12/12/02
Posts: 38425
Loc: 'Stralia

Have posted it back in 2013, but wrong place

2011 viscosity classification task force preso

Of course we know what we ultimately got in J300, this is a part of the road

#4536424 - 10/07/17 06:40 PM Re: 2010 paper on extending viscosity grades <20 [Re: Shannow]
ZeeOSix Offline

Registered: 07/22/10
Posts: 16793
Loc: PNW
Interesting paper. Figure 2a tells me that bearing wear for viscosity below the current minimum of 2.6 mPa.s goes off the cliff with the big step change in the curve. Looks like main bearings aren't as sensitive to low HTHS like rod bearings.

"Additional work demonstrated that a similar step change in wear can be observed in piston ring and cam face wear [7]."

What I don't get however in Figures 2a and 2b is why does the bearing wear increase the other way as the HTHS and MOFT increases? More bearing wear on cold starts with thicker oil possibly? Figure 2a would indicate that xW-20 with HTHS of around 2.5~2.6 gives the least bearing wear.

SAE paper that Figures 2a and 2b references:
We Don't Need No Stinkin' Efficiency!

#4536443 - 10/07/17 07:04 PM Re: 2010 paper on extending viscosity grades <20 [Re: ZeeOSix]
Shannow Offline

Registered: 12/12/02
Posts: 38425
Loc: 'Stralia
Fair commentary...but then look at 3b, which is more in line with what would be expected.

Engine specifics play a difference, different engines having different issues and behaviours.

This is the link for 3B

interesting comments in the summary...

#4537812 - 10/09/17 10:06 AM Re: 2010 paper on extending viscosity grades <20 [Re: Shannow]
wemay Offline

Registered: 04/04/12
Posts: 8389
Loc: Southeast Florida
I wonder if anything has changed since this paper was released. It really questions the decision to use a, recommended by the OEM, xw20 in applications not strictly designed to use it. Like my Sonata.
17 Hyundai Sonata 2.4 | RP 5w20 | OEM | WIX
13 Hyundai Santa Fe 2.0T | PP 5w30 | OEM | WIX (Wife)
18 Honda HR-V 1.5, CVT | FF 0w20 | OEM | OEM (Mom)