Mixing Formula Plus and Dexron III

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Oct 13, 2018
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MA
2013 FLSTC

I recently changed my primary fluid to Dexron III and want to go back to Formula +. Do I need to remove the cover and wash all the ATF out. Or, can I drain the ATF and fill with F+. Just wondering how well they would mix with the few ounces of ATF residual.
 
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You can, but if you want it all out, put a zip tie on the clutch lever. Leave it to drain all night.

You can also do this and start the engine at idle for a few seconds.

Fill with F1 and be happy.
 
I tried other fluids as well and just went back to Formula+. It works.

The only thing I buy at the HD dealer is chrome oil filters and Formula+
 
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