Fluid types
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Novice
Joined: Jul 2019
Posts: 22
Likes: 1
From: ontario
Fluid types
Hi guys. I am new to the forum and to harleys. Last summer I bought a 1994 fatboy with the eco. Bike only has 25000 miles. We love it. Now I am at the point where I want to change the fluids. In every else I use synthetic.
I was hoping you guys could steer me in the right direction with my new bike.
what fluids should I use?
I was hoping you guys could steer me in the right direction with my new bike.
what fluids should I use?
Ever body so grumpy 'round here today! 
Hotrod's right: HD wrote a book that has all the answers in it. You should trust them.
Here's my answer: (And I'm not saying this is the best answer, or even the right answer, but it is my answer.) Lucas conventional 20W50 in the oil tank, RedLine Shockproof in the trans. Whatever cheapo ATF you can find in the primary.
Hotrod's right: HD wrote a book that has all the answers in it. You should trust them.
Here's my answer: (And I'm not saying this is the best answer, or even the right answer, but it is my answer.) Lucas conventional 20W50 in the oil tank, RedLine Shockproof in the trans. Whatever cheapo ATF you can find in the primary.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
You might find that running synthetics will cause a base gasket leak in your '94.
That is unless someone has changed the head and base gaskets to Cometic or James steel gaskets.
Ask 100 people what fluids you should run in your bike and you'll get 100 different answers.
As for me I run Valvoline VR1 20w-50 in the motor, Amsoil 75-140 in the transmission, and whatever cheap ATF (usually type F) in the primary.
As mentioned previously one of the first things you need for that bike is a Harley Factory Service Manual.
It will give you all kinds of useful information.
That is unless someone has changed the head and base gaskets to Cometic or James steel gaskets.
Ask 100 people what fluids you should run in your bike and you'll get 100 different answers.
As for me I run Valvoline VR1 20w-50 in the motor, Amsoil 75-140 in the transmission, and whatever cheap ATF (usually type F) in the primary.
As mentioned previously one of the first things you need for that bike is a Harley Factory Service Manual.
It will give you all kinds of useful information.
Grand HDF Member
Joined: Apr 2007
Posts: 3,725
Likes: 3,070
From: Brighton, MI
Conventional Valvolene racing 20w-50, usually a 80w-90 or a 75w-140, or a mix of both in the trans (conventional), and conventional 10w-40 or 15w-40 in the primary. In addition to cylinder base gasket leaks with synthetic, the evo engine seems to make a little more noise with it in there. YD
Stellar HDF Member
Joined: Feb 2007
Posts: 2,558
Likes: 280
From: Russellville, Arkansas
Conventional Valvolene racing 20w-50, usually a 80w-90 or a 75w-140, or a mix of both in the trans (conventional), and conventional 10w-40 or 15w-40 in the primary. In addition to cylinder base gasket leaks with synthetic, the evo engine seems to make a little more noise with it in there. YD
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Tourer
Joined: Sep 2018
Posts: 294
Likes: 179
From: Sevilla, Spain
Vr1 20w50, castrol 75w140 and atf works for me, not only on my Evo. I use this combo on my tc 88 and 103
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An owner's manual (as opposed to a service manual) can be had off of eBay for cheap.