Engine oil in Primary
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Novice
Joined: Jan 2023
Posts: 22
Likes: 4
From: New York
Engine oil in Primary
Hey guys, I have read some conflicting information around using engine oil,
specifically 20W50, in the primary and transmission casings. I understand there’s a recommendation to use different oil in each, however, some sources are saying it is fine to use the same oil in all three. Thoughts?
specifically 20W50, in the primary and transmission casings. I understand there’s a recommendation to use different oil in each, however, some sources are saying it is fine to use the same oil in all three. Thoughts?
Seasoned HDF Member
Joined: Aug 2006
Posts: 24,537
Likes: 30,864
From: Pennsylvania
Follow the recommendations in your owner's manual. 
And if you post over in the Oil forum, you may get more response, just saying.
https://www.hdforums.com/forum/oil-a...ted-topics-30/
You can thank me later.
And if you post over in the Oil forum, you may get more response, just saying.
https://www.hdforums.com/forum/oil-a...ted-topics-30/
You can thank me later.
Last edited by CoolBreeze3646; Feb 2, 2023 at 05:17 PM.
Road Warrior
Joined: Aug 2020
Posts: 1,300
Likes: 2,142
From: NC
I like to use extra virgin olive oil in mine, the kind made by real virgins 
uh thank you, but seriously, not saying this is what you should do, but I use elcheapo Shell 20w50 in all three holes, never had issue, put 80+ thousand miles on a sporty using the same oil in motor and primary, also 0 issues.
uh thank you, but seriously, not saying this is what you should do, but I use elcheapo Shell 20w50 in all three holes, never had issue, put 80+ thousand miles on a sporty using the same oil in motor and primary, also 0 issues.
Supporter
Joined: Jan 2007
Posts: 15,788
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From: along the shore of Mishigami
When you put gas in the gas tank, where do you put the gas cap? It's already been mentioned but go to the oil subforum and think about what you want to use where. By the way do you wear fingerless gloves?
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HDF Community Team
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If you want to live on the edge, you could follow the manufacturer’s recommendations.
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Seasoned HDF Member
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From: State of Confusion
Hey guys, I have read some conflicting information around using engine oil,
specifically 20W50, in the primary and transmission casings. I understand there’s a recommendation to use different oil in each, however, some sources are saying it is fine to use the same oil in all three. Thoughts?
specifically 20W50, in the primary and transmission casings. I understand there’s a recommendation to use different oil in each, however, some sources are saying it is fine to use the same oil in all three. Thoughts?