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Twin Cam 1450 FXDXEngine , Transmission and Primary Chain case need the same oil. I use AMSOIL MCV 20W-50.a little steep in cost but worth it.

as a parts associate in a Harley Davidson dealer, in a twin cam Dyna you use 4 qts in the engine, FORMULA + in the transmission (1 qt if 6 speed, 18-20oz if 5 speed) and FORMULA + ALSO in the primary. We sell the most of engine oil HARLEY DAVIDSON BRAND 20w50 for engine, formula + is a oil on its own, very light weight. If you use synthetic, you should use in ALL 3 areas though. and I would stick to the Harley Davidson brand oil.

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13y ago
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Q: What oil do you use in a Dyna Super Glide motorcycle?
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