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Castrol Power RS V–Twin 4T , Castrol Power RS V-Twin with Trizone Technology is a full synthetic 4-stroke motorcycle oil exclusively designed for modern V-Twin engines, transmissions, & primary chaincases. It has been engineered and tested for performance in Harley- Davidson® motorcycles.

BENEFITS

Full synthetic 4-stroke motorcycle oil
Provides excellent protection against thermal and viscosity breakdown under high temperatures generated by air-cooled V-Twin engines
Delivers proven wet clutch performance allowing for smooth operation & protection
Suitable for all Japanese & North American 4-stroke motorcycles where SAE 20W-50 is recommended


SPECIFICATIONS
API SERVICE: Exceeds API SL
JASO (T903): JASO MA-2
VISCOSITY: SAE 20W-50
Cycle Gear carries it.
http://www.castrol.com/castrol/sectiongenericarticle.do?categoryId=9021705&contentId=7040548
 

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I use mobil 15/40 super 1300 {it's a diesel oil} It has everything a big v-twin needs that has the transmission part of the engine.Also seems to help the valve train noise when hot going down the hwy.I have also used castrol 20/50 which worked great.Just wanted to try something else.
 
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