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2010 paper on extending viscosity grades <20 #4536416
10/07/17 06:21 PM
10/07/17 06:21 PM
Joined: Dec 2002
Posts: 40,896
'Stralia
Shannow Online content OP
Shannow  Online Content OP
Joined: Dec 2002
Posts: 40,896
'Stralia
2010-01-2286

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

Re: 2010 paper on extending viscosity grades <20 [Re: Shannow] #4536424
10/07/17 06:40 PM
10/07/17 06:40 PM
Joined: Jul 2010
Posts: 18,725
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 18,725
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: http://papers.sae.org/892154/

Re: 2010 paper on extending viscosity grades <20 [Re: ZeeOSix] #4536443
10/07/17 07:04 PM
10/07/17 07:04 PM
Joined: Dec 2002
Posts: 40,896
'Stralia
Shannow Online content OP
Shannow  Online Content OP
Joined: Dec 2002
Posts: 40,896
'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

http://papers.sae.org/922342/

interesting comments in the summary...

Re: 2010 paper on extending viscosity grades <20 [Re: Shannow] #4537812
10/09/17 10:06 AM
10/09/17 10:06 AM
Joined: Apr 2012
Posts: 9,387
Kendall, FL
wemay Offline
wemay  Offline
Joined: Apr 2012
Posts: 9,387
Kendall, FL
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.


'18 KIA Sportage LX AWD 2.4L: MSS 10w30
'13 Hyundai Santa Fe Sport 2.0T: EDGE 5w30

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