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Shearing = shift quality degradation... ? #4743431
04/30/18 01:29 PM
04/30/18 01:29 PM
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
webfors Offline OP
webfors  Offline OP
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
I have read almost every thread discuss how shift quality deteriorates over the course of an OCI. Is this directly caused by the level of shearing an oil experiences? Or is there something else at play?


17 Cadillac ATS 2.0T, Edge D1G2 5w30, XG10575
17 Dodge GC, VWB 5w20, Fram DL11665
15 DL650, Rotella T6 5w40, KN-138
Small engines; RT5 10w30
Re: Shearing = shift quality degradation... ? [Re: webfors] #4743485
04/30/18 02:24 PM
04/30/18 02:24 PM
Joined: Sep 2002
Posts: 3,454
Arkansastan
Propflux01 Offline
Propflux01  Offline
Joined: Sep 2002
Posts: 3,454
Arkansastan
Yes, a lot of it is. Gears shear the [censored] out of oil, and most motorcycles share the sump.


2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"
Re: Shearing = shift quality degradation... ? [Re: webfors] #4743515
04/30/18 02:48 PM
04/30/18 02:48 PM
Joined: May 2010
Posts: 1,094
Ocala, Florida
racin4ds Offline
racin4ds  Offline
Joined: May 2010
Posts: 1,094
Ocala, Florida
This has been the case for many years with shared sump bikes/quads. I've dealt with it for a long time in just about every make and model. My current '11 KingQuad 400 shears oil fast and gets very notchy within 500miles. My 08 Kawasaki Ninja 650 does also when using the recommended 10W40 lube. I even went with some Castrol 10W40 full syn this time and it lasted longer but still gets very notchy after 1000 miles or so.


Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
Re: Shearing = shift quality degradation... ? [Re: webfors] #4743553
04/30/18 03:23 PM
04/30/18 03:23 PM
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
webfors Offline OP
webfors  Offline OP
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
In which case your viscosity choice should compensate for 20-30% shearing in a shared sump if you want to maintain decent shift quality for the majority of the OCI.

Or... use an oil that doesn't shear... which is rare.


17 Cadillac ATS 2.0T, Edge D1G2 5w30, XG10575
17 Dodge GC, VWB 5w20, Fram DL11665
15 DL650, Rotella T6 5w40, KN-138
Small engines; RT5 10w30
Re: Shearing = shift quality degradation... ? [Re: webfors] #4743654
04/30/18 05:20 PM
04/30/18 05:20 PM
Joined: Jul 2015
Posts: 4,629
Down Under
SR5 Online content
SR5  Online Content
Joined: Jul 2015
Posts: 4,629
Down Under
Yes as oil ages in a shared sump motorcycles the polymer VII are sheared or cut by the mechanical action of the gears. This causes the viscosity to drop and the gear change to go bad. Notchy at first, but soon you end up missing gear changes or requiring a lot of boot to get it into gear.

I tend to run thicker oils so they shear into grade after 1000 miles, rather than out of grade.


Castrol GTX Ultraclean 15W40 A3/B3 + Wesfil-Cooper Z154
Re: Shearing = shift quality degradation... ? [Re: webfors] #4743659
04/30/18 05:26 PM
04/30/18 05:26 PM
Joined: May 2006
Posts: 759
Portland, Oregon
Joshua_Skinner Offline
Joshua_Skinner  Offline
Joined: May 2006
Posts: 759
Portland, Oregon
My 1998 Honda VFR 800 shifts fine throughout the 5k mi OCI. I've been using Mobil 1 5W-40 Turbo Diesel Truck that I got on clearance at Auto Zone. Once that's gone I'll use the Pennzoil Platinum Euro 0W-40 I got on clearance at WalMart.


2015 Nissan Frontier S King Cab, 2.5L, 5MT
Pennzoil Platinum 5W-30 in the crankcase. Red Line in the gearboxes.
Re: Shearing = shift quality degradation... ? [Re: SR5] #4743671
04/30/18 05:37 PM
04/30/18 05:37 PM
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
webfors Offline OP
webfors  Offline OP
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
Originally Posted By: SR5
Yes as oil ages in a shared sump motorcycles the polymer VII are sheared or cut by the mechanical action of the gears. This causes the viscosity to drop and the gear change to go bad. Notchy at first, but soon you end up missing gear changes or requiring a lot of boot to get it into gear.

I tend to run thicker oils so they shear into grade after 1000 miles, rather than out of grade.


This is what I'm thinking with the recent purchase of Valvoline 20w50.


17 Cadillac ATS 2.0T, Edge D1G2 5w30, XG10575
17 Dodge GC, VWB 5w20, Fram DL11665
15 DL650, Rotella T6 5w40, KN-138
Small engines; RT5 10w30
Re: Shearing = shift quality degradation... ? [Re: Joshua_Skinner] #4743672
04/30/18 05:38 PM
04/30/18 05:38 PM
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
webfors Offline OP
webfors  Offline OP
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
Originally Posted By: Joshua_Skinner
My 1998 Honda VFR 800 shifts fine throughout the 5k mi OCI. I've been using Mobil 1 5W-40 Turbo Diesel Truck that I got on clearance at Auto Zone. Once that's gone I'll use the Pennzoil Platinum Euro 0W-40 I got on clearance at WalMart.


Your bike doesn't require Jaso spec oil?


17 Cadillac ATS 2.0T, Edge D1G2 5w30, XG10575
17 Dodge GC, VWB 5w20, Fram DL11665
15 DL650, Rotella T6 5w40, KN-138
Small engines; RT5 10w30
Re: Shearing = shift quality degradation... ? [Re: webfors] #4743744
04/30/18 07:06 PM
04/30/18 07:06 PM
Joined: Aug 2010
Posts: 1,081
pa
benjy Offline
benjy  Offline
Joined: Aug 2010
Posts: 1,081
pa
any type of oil using a smaller spread will use less VII that shear, an oils first # besides the cold flow is what base oil is used before adding VII so a 15-40 is inherently better than 10-40's + the quality of the VI's are many. cheap oil cheap polymers aka VII. of course you must consider riding temps as well!!! true synthesised synthetics are far better requiring very little VII + generally last longer if you don't mind paying $10+ a quart, of course there are other benefits as well. those that DIY can easily change their oil sooner + be better protected + have better shifting. rotella T 15-40 a cheaper conventional diesel oil is quite popular for that reason !!!

Re: Shearing = shift quality degradation... ? [Re: webfors] #4743792
04/30/18 07:45 PM
04/30/18 07:45 PM
Joined: Aug 2004
Posts: 4,706
Katy, Republic of Texas
blupupher Offline
blupupher  Offline
Joined: Aug 2004
Posts: 4,706
Katy, Republic of Texas
Originally Posted By: webfors
Originally Posted By: Joshua_Skinner
My 1998 Honda VFR 800 shifts fine throughout the 5k mi OCI. I've been using Mobil 1 5W-40 Turbo Diesel Truck that I got on clearance at Auto Zone. Once that's gone I'll use the Pennzoil Platinum Euro 0W-40 I got on clearance at WalMart.


Your bike doesn't require Jaso spec oil?

Most bikes run fine with diesel oil. No "Energy Conserving" on diesel oil so no clutch issues.

I run Peak 15w-40 syn blend diesel oil in my bike, and have used Supertech 15w-40 as well.
I am just starting to notice some notchiness in shifting and difficulty finding neutral @ 2200 miles on the oil, so will be changing it soon.


2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
1994 Honda VT1100: Peak 15w-40/PSL/2500 mile OCI

Re: Shearing = shift quality degradation... ? [Re: webfors] #4743817
04/30/18 08:01 PM
04/30/18 08:01 PM
Joined: Dec 2016
Posts: 72
Greece
Panos Offline
Panos  Offline
Joined: Dec 2016
Posts: 72
Greece
No shifting degradation ever experienced in both of my bikes (see my signature) using motul oil only.uoa showed pretty decent sharing also in both of them. Never felt any difference during the interval or after changing the oil (which I did about 15 times in 85.000km total)


Ford fiesta 1.6 mk6 Motul specific 913D/Motul Gear 300
Kawasaki ninja 250r Motul 5100 10w40
Honda cbr600f Pc41 Motul 7100 10w30
Re: Shearing = shift quality degradation... ? [Re: Panos] #4743847
04/30/18 08:19 PM
04/30/18 08:19 PM
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
webfors Offline OP
webfors  Offline OP
Joined: Jun 2006
Posts: 5,034
Great White North.. eh
Originally Posted By: Panos
No shifting degradation ever experienced in both of my bikes (see my signature) using motul oil only.uoa showed pretty decent sharing also in both of them. Never felt any difference during the interval or after changing the oil (which I did about 15 times in 85.000km total)


So that's interesting.. because your UOA showed significant shearing, yet you noticed no difference in shifting quality..


17 Cadillac ATS 2.0T, Edge D1G2 5w30, XG10575
17 Dodge GC, VWB 5w20, Fram DL11665
15 DL650, Rotella T6 5w40, KN-138
Small engines; RT5 10w30
Re: Shearing = shift quality degradation... ? [Re: webfors] #4743928
04/30/18 09:13 PM
04/30/18 09:13 PM
Joined: Aug 2004
Posts: 4,706
Katy, Republic of Texas
blupupher Offline
blupupher  Offline
Joined: Aug 2004
Posts: 4,706
Katy, Republic of Texas
Originally Posted By: webfors
Originally Posted By: Panos
No shifting degradation ever experienced in both of my bikes (see my signature) using motul oil only.uoa showed pretty decent sharing also in both of them. Never felt any difference during the interval or after changing the oil (which I did about 15 times in 85.000km total)


So that's interesting.. because your UOA showed significant shearing, yet you noticed no difference in shifting quality..

Some bikes are not as susceptible to shifting problems from shearing as other bikes.


2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
1994 Honda VT1100: Peak 15w-40/PSL/2500 mile OCI

Re: Shearing = shift quality degradation... ? [Re: webfors] #4744063
05/01/18 01:07 AM
05/01/18 01:07 AM
Joined: Dec 2016
Posts: 72
Greece
Panos Offline
Panos  Offline
Joined: Dec 2016
Posts: 72
Greece
That's also my conclusion after reading and hearing so many reporting shifting quality difference. At the same time , very few people I know or post here seem to use the motul brand.


Ford fiesta 1.6 mk6 Motul specific 913D/Motul Gear 300
Kawasaki ninja 250r Motul 5100 10w40
Honda cbr600f Pc41 Motul 7100 10w30
Re: Shearing = shift quality degradation... ? [Re: Panos] #4744082
05/01/18 02:09 AM
05/01/18 02:09 AM
Joined: Dec 2005
Posts: 2,991
The Canyons
02SE Offline
02SE  Offline
Joined: Dec 2005
Posts: 2,991
The Canyons
Originally Posted By: Panos
That's also my conclusion after reading and hearing so many reporting shifting quality difference. At the same time , very few people I know or post here seem to use the motul brand.


I've tried most brands out there over the years, and Motul 300V 4T is my favorite. The bikes run great, and shift perfectly for the entire OCI. I've tried numerous HDEO's, and the shifting always quickly degrades in my bikes.

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