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Is this the same trans fluid

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Old May 13, 2026 | 07:55 AM
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Default Is this the same trans fluid
Harley keeps changing bottles is this the same. I am using this for my 2011 flhp and I know it takes more than a quart thanks
 
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Old May 13, 2026 | 08:08 AM
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There is no way of knowing unless you send it to a lab.

But I wouldn`t hesitate to use either one, or mix.

Harley quietly switched from one to the other.

I don`t think any 6 speed transmission takes more than 1 quart...
 
Last edited by Dan89FLSTC; May 13, 2026 at 08:15 AM.
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Old May 13, 2026 | 08:11 AM
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I say "run it"
No worries
 
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Old May 13, 2026 | 08:24 AM
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Just looking at the labels one says heavy synthetic and the other says synthetic blend. I'm not a chemical engineer so I can't say whether it hurts to mix them or not.
 
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Old May 13, 2026 | 08:39 AM
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Here are the capacities
consider that no one is "flushing" out the old spec before adding the new spec so "mixing" doesn`t matter

 
Last edited by eighteight; May 13, 2026 at 08:42 AM.
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Old May 13, 2026 | 09:39 AM
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Originally Posted by eighteight
Here are the capacities
consider that no one is "flushing" out the old spec before adding the new spec so "mixing" doesn`t matter
You mean, here are the capacities according to AI....

 
Last edited by Dan89FLSTC; May 13, 2026 at 09:45 AM.
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Old May 13, 2026 | 09:44 AM
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Originally Posted by Dan89FLSTC
You mean, here are the capacities according to AI....
Exactly
And much like mixing the 2 bottles, I`m not overly concerned about + or - an ounce or 2 in an oil bath / splash box
Then again, I`m a hack
 
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Old May 13, 2026 | 10:18 AM
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Well in my notes to fill it was a little more then a quart. I thought possibly that same velocity and synthetic. I hate to spend another 20 bucks. I will drain it first fill up to the diaphragm like the manual says but it does say more then a quart
 
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Old May 13, 2026 | 10:24 AM
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Originally Posted by 98glider
I will drain it first fill up to the diaphragm like the manual says but it does say more then a quart
Diaphragm tells me you are taking about the primary chaincase and not the transmission
2 different animals
 
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Old May 13, 2026 | 11:44 AM
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Yes oops. Primary
 
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