(Cause it's accessible and cheap (165,000 miles.))
Evo Questions
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Joined: Jun 2019
Posts: 83
Likes: 25
From: Alabama
Evo Questions
Ok, so I got the 1997 FLHTCUI. I serviced it this time with Harley conventional 20w50 and Formula Plus in primary and tranny.
I have been told that I should try the following:
Engine - any good conventional 20w50 motorcycle oil
Primary - 10w40 conventional motorcycle oil
Tranny - 75w90 Synthetic year oil
All thoughts are appreciated. The only one that concerns me is the synthetic gear oil in the tranny. Some say yes and some say no way.
I have been told that I should try the following:
Engine - any good conventional 20w50 motorcycle oil
Primary - 10w40 conventional motorcycle oil
Tranny - 75w90 Synthetic year oil
All thoughts are appreciated. The only one that concerns me is the synthetic gear oil in the tranny. Some say yes and some say no way.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,603
Likes: 3,374
From: Cental, MI
Ok, so I got the 1997 FLHTCUI. I serviced it this time with Harley conventional 20w50 and Formula Plus in primary and tranny.
I have been told that I should try the following:
Engine - any good conventional 20w50 motorcycle oil
Primary - 10w40 conventional motorcycle oil
Tranny - 75w90 Synthetic year oil
All thoughts are appreciated. The only one that concerns me is the synthetic gear oil in the tranny. Some say yes and some say no way.
I have been told that I should try the following:
Engine - any good conventional 20w50 motorcycle oil
Primary - 10w40 conventional motorcycle oil
Tranny - 75w90 Synthetic year oil
All thoughts are appreciated. The only one that concerns me is the synthetic gear oil in the tranny. Some say yes and some say no way.
or straight weights in older stuff... [I consider the late '90's as "New"]
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,200
Likes: 3,089
From: NW AR
I use synthetic ATF in the primary. I currently have Mobil SHC630 in my tranny, but will probably go to whatever Redline recommends for it when I run out of SHC630.
Last edited by Dr.Hess; Jul 20, 2019 at 10:44 AM.
Road Warrior
Joined: Apr 2018
Posts: 1,347
Likes: 820
From: Moneta, Virginia
I swapped to synthetics after 10k miles on my 97 FLHR, way back in 99. Ive been over 90k since without any issues.
Mobil 1 15-50
Redline MTL in the primary
Redline Heavy Shockproof in the transmission
I used HD 20-50 for an oil change once on road trip... it stayed cleaner looking a lot longer than the Mobil 1. Made me wonder where the contaminates went!
Mobil 1 15-50
Redline MTL in the primary
Redline Heavy Shockproof in the transmission
I used HD 20-50 for an oil change once on road trip... it stayed cleaner looking a lot longer than the Mobil 1. Made me wonder where the contaminates went!
Seasoned HDF Member
Joined: Jan 2009
Posts: 5,149
Likes: 2,975
From: WACO
I have heard that some Evo riders in hot climates use 60 weight dino oil. Because it lessens engine noise. I switched from Amsoil 20-50 to Amsoil 60 weight. I may try 60 weight dino oil next oil change.
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Seasoned HDF Member
Joined: May 2008
Posts: 21,173
Likes: 12,740
From: South Carolina
20w50 is all any Evo needs.
No reason to dump SAE 60 oil into an Evo...
But some people would use SAE 70 if they could find it.
No reason to dump SAE 60 oil into an Evo...
But some people would use SAE 70 if they could find it.
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Stellar HDF Member
Joined: Feb 2007
Posts: 2,558
Likes: 280
From: Russellville, Arkansas
Ive started using Mystic semi-synthetic 15w50 by the gallon at a Atwoods store 10-$12. If not that....cheapest 20w50 I can find. A few winters.....Ive run diesel 15w40, but never in the summer. Several years ago.....I rode out in Arizona & New Mexico.....ran 25w60 in really hot weather.
Primary.....I like diesel 15w40. I liked ATF fluid, but it always found the weakest part of the gasket seeped out. Whatever you use...avoid the conservation energy....ones with the star on them. Or your clutch might start slipping.
Transmission....just use gear oil. 80w90
Primary.....I like diesel 15w40. I liked ATF fluid, but it always found the weakest part of the gasket seeped out. Whatever you use...avoid the conservation energy....ones with the star on them. Or your clutch might start slipping.
Transmission....just use gear oil. 80w90
