75/90 or 75/140 in '14 RK Tranny?
#21
06-09-2016 | 12:52 PM
Thread Starter
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Tourer
Joined: Apr 2006
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Likes: 13
#22
06-09-2016 | 12:55 PM
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
***Never mind, I just looked and the shock proof is 75/90...still pours like sludge though.***
Hard to believe 140 is too heavy when people have had such good luck redline shock proof in the tranny. The red line flows like molasses.
Maybe they had seal problems tough long term...?
Hard to believe 140 is too heavy when people have had such good luck redline shock proof in the tranny. The red line flows like molasses.
Maybe they had seal problems tough long term...?
#24
06-09-2016 | 08:25 PM
Extreme HDF Member
Joined: Jun 2011
Posts: 10,216
Likes: 219
From: Glendale AZ
Hey all,
Getting ready to change fluids in my '14 RK.
Not to bait another oil debate here, but I was curious of everyone's opinion regarding using 75/90 vs 75/140 weight synthetic gear oil in a '14 RK.
I do my own maintenance if possible, however I had the dealer do the initial 1,000 mile service and they installed 75/140 syn gear oil in the tranny.
I live in eastern PA...summers get hot/humid. Is 75/140 a better alternative than 75/90?? I plan on a 10K tranny gear oil change interval going forward.
Thanks all..
Getting ready to change fluids in my '14 RK.
Not to bait another oil debate here, but I was curious of everyone's opinion regarding using 75/90 vs 75/140 weight synthetic gear oil in a '14 RK.
I do my own maintenance if possible, however I had the dealer do the initial 1,000 mile service and they installed 75/140 syn gear oil in the tranny.
I live in eastern PA...summers get hot/humid. Is 75/140 a better alternative than 75/90?? I plan on a 10K tranny gear oil change interval going forward.
Thanks all..
You can see by the graph 75-90 puts your in the favorable 50w range.
Last edited by TUCCI; 06-09-2016 at 08:28 PM.
#25
06-09-2016 | 09:18 PM
Ultimate HDF Member
Joined: Feb 2009
Posts: 5,132
Likes: 228
From: Garland, TX
To answer your question: No, they both have one job to do and they both will do it. So you can get Mobile 1 75w/90 for around $9.99 a bottle or Mobile 1 75W/140 for around $19.99 a bottle... I've used both and couldn't tell a difference. So since I change mine at least once a year, I go with the 75w/90.
#26
06-09-2016 | 10:24 PM
Grand HDF Member
Joined: Aug 2011
Posts: 4,087
Likes: 3,990
From: U.S.A. Upstate N. Y.
Transmission oil
Here is what I use in my 012' Ultra. =
Heavy Duty Platinum Full Synthetic 6 speed Transmission Lube
Designed by Spectro in response to complaints from Harley owners about the great but noisy new 6-speed transmission, this full synthetic provides ultimate lubrication protection. Formulated to significantly reduce gear noise and provide easier, smoother shifting, this SAE 75w140 formulation eases shifting even when cold. High loads and extreme heat do not affect the oil, so it performs well when pushed hard and long. A.P.I. GL-5 rated
#27
06-09-2016 | 10:34 PM
Banned
Joined: Jul 2008
Posts: 1,036
Likes: 67
There is no question that a 140 weight gear lube is make for a quieter transmission but I have always felt it was too thick for these lightweight Harley transmissions. Lighter viscosity will lube better in a 6 speed tranny.
Again, it is all about personal preference. Anything will work ok for the first 24 months, or until the warranty is over. After that you need a good quality lube that will provide years of service. I think some of the dealers make bad recommendations to their new bike customers by recommending questionable products.
Just use what you feel comfortable with. There is no "best or worst". Some are better suited than others though. Read your manual.
Again, it is all about personal preference. Anything will work ok for the first 24 months, or until the warranty is over. After that you need a good quality lube that will provide years of service. I think some of the dealers make bad recommendations to their new bike customers by recommending questionable products.
Just use what you feel comfortable with. There is no "best or worst". Some are better suited than others though. Read your manual.
#28
06-09-2016 | 11:12 PM
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
There is no question that a 140 weight gear lube is make for a quieter transmission but I have always felt it was too thick for these lightweight Harley transmissions. Lighter viscosity will lube better in a 6 speed tranny.
Again, it is all about personal preference. Anything will work ok for the first 24 months, or until the warranty is over. After that you need a good quality lube that will provide years of service. I think some of the dealers make bad recommendations to their new bike customers by recommending questionable products.
Just use what you feel comfortable with. There is no "best or worst". Some are better suited than others though. Read your manual.
Again, it is all about personal preference. Anything will work ok for the first 24 months, or until the warranty is over. After that you need a good quality lube that will provide years of service. I think some of the dealers make bad recommendations to their new bike customers by recommending questionable products.
Just use what you feel comfortable with. There is no "best or worst". Some are better suited than others though. Read your manual.
#29
06-09-2016 | 11:24 PM
Tourer
Joined: May 2012
Posts: 461
Likes: 46
From: Left Coast
Here is what I use in my 012' Ultra. =
Heavy Duty Platinum Full Synthetic 6 speed Transmission Lube
Designed by Spectro in response to complaints from Harley owners about the great but noisy new 6-speed transmission, this full synthetic provides ultimate lubrication protection. Formulated to significantly reduce gear noise and provide easier, smoother shifting, this SAE 75w140 formulation eases shifting even when cold. High loads and extreme heat do not affect the oil, so it performs well when pushed hard and long. A.P.I. GL-5 rated
#30
06-10-2016 | 04:43 AM
Ultimate HDF Member
Joined: Jun 2009
Posts: 6,899
Likes: 3,407
From: OH
Here is what I use in my 012' Ultra. =
Heavy Duty Platinum Full Synthetic 6 speed Transmission Lube
Designed by Spectro in response to complaints from Harley owners about the great but noisy new 6-speed transmission, this full synthetic provides ultimate lubrication protection. Formulated to significantly reduce gear noise and provide easier, smoother shifting, this SAE 75w140 formulation eases shifting even when cold. High loads and extreme heat do not affect the oil, so it performs well when pushed hard and long. A.P.I. GL-5 rated