What a difference gear oil can make?
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Intermediate
Joined: Apr 2007
Posts: 26
Likes: 0
What a difference gear oil can make?
I have been running Syn3 and Amsoil 20w50 in all 3 holes. Well I took everyones advice and got it out of the trans. I put Belray in ( I might try Mobil 1 75w90 next)As soon as I made my first shift into 1st gear it was so smoooth... I used to get a big CLUNK... Thanks every one..
Outstanding HDF Member
Joined: Jul 2006
Posts: 2,303
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From:
RE: What a difference gear oil can make?
This is much heavier fluid than I would believe HD would approve,esp for those still in cold weather.I would at least consider what has happened before w/sheared dip sticks.
Road Captain
Joined: Apr 2006
Posts: 554
Likes: 0
From: Western Washington State
RE: What a difference gear oil can make?
Motor oil and gear oils are not created equal for example the 85W-140 viscosity gear oil is roughly the equivalent to a 20W-50 motor oil consequently the use of an 85W-140 gear oil will not result in a viscosity conflict. The polymers added to make multi viscosity oils prevent the oil from thinning as much as it warms up and do not add any additional viscosity when they are cold.
"At cold temperatures the polymers are coiled up and allow the oil to flow as their low numbers indicate. As the oil warms up the polymers begin to unwind into long chains that prevent the oil from thinning as much as it normally would. The result is that at 100 degrees C the oil has thinned only as much as the higher viscosity number indicates. Another way of looking at multi-vis oils is to think of a 20W-50 (85W-140)as a 20 (85) weight oil that will not thin more than a 50 (140) weight would when hot."
Hope this helps,
FBL
"At cold temperatures the polymers are coiled up and allow the oil to flow as their low numbers indicate. As the oil warms up the polymers begin to unwind into long chains that prevent the oil from thinning as much as it normally would. The result is that at 100 degrees C the oil has thinned only as much as the higher viscosity number indicates. Another way of looking at multi-vis oils is to think of a 20W-50 (85W-140)as a 20 (85) weight oil that will not thin more than a 50 (140) weight would when hot."
Hope this helps,
FBL
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
RE: What a difference gear oil can make?
ORIGINAL: liv2hunt
I have been running Syn3 and Amsoil 20w50 in all 3 holes. Well I took everyones advice and got it out of the trans. I put Belray in ( I might try Mobil 1 75w90 next)As soon as I made my first shift into 1st gear it was so smoooth... I used to get a big CLUNK... Thanks every one..
I have been running Syn3 and Amsoil 20w50 in all 3 holes. Well I took everyones advice and got it out of the trans. I put Belray in ( I might try Mobil 1 75w90 next)As soon as I made my first shift into 1st gear it was so smoooth... I used to get a big CLUNK... Thanks every one..
Road Warrior
Joined: Jan 2007
Posts: 1,661
Likes: 2
From: Monroe, Louisiana
RE: What a difference gear oil can make?
iclick,
did you go straight to 85/140 from formula + or syn 3? i'm planning on going to 75/90 gear oil (not sure yet what kind). should i just skip it and go to 85/140?
did you go straight to 85/140 from formula + or syn 3? i'm planning on going to 75/90 gear oil (not sure yet what kind). should i just skip it and go to 85/140?
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Tourer
Joined: Jun 2006
Posts: 487
Likes: 1
From: Pittsburgh PA
RE: What a difference gear oil can make?
Any of you guys run the 85/140 Royal Purple in the primary case?
Do you think this would be ok with the clutch plates?
I have my primary open now, and there is a shop that sells the Royal Purple right down the street.
Thanks
Do you think this would be ok with the clutch plates?
I have my primary open now, and there is a shop that sells the Royal Purple right down the street.
Thanks
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Novice
Joined: Mar 2007
Posts: 17
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From: Maryland
RE: What a difference gear oil can make?
Same here the best $10.00 I"V spent yet. I placed Mobil 1 75w90 in the transmission after reading about it on this form. I changed it at 1000 miles and I canât believe the difference it made. I never had a Harley shift this smooth. I can now shift to neutral from second. No more searching for neutral at stop lights. Shifts smoother and is quieter.