I questioned Castrol regarding there Castrol RS V-Twin oil engineered and tested for Harley Davidson, (Says on the Bottle)
I could not believe the response I recieved, Holy [censored]!! They also told me over the phone to make sure I let my HD dealer know what Castrol is recommending?
Thank you for contacting Castrol.
Harley-Davidson recommends the use of their genuine oils at all times or, if not available, to use an SAE 20W-50, API SL/CF oil that meets their HD 240 (1996-2005 model year) or HD 360 (2006 and newer model year) ratings.
Although we have no doubt that our Power RS products will provide the required protection and performance in Harley-Davidson engines, they are not approved under HD 240 / HD 360 or claim API CF. Therefore, if a motorcycle engine is still under warranty, we recommend that only Harley-Davidson genuine oils be used.
Castrol Consumer Relations
I could not believe the response I recieved, Holy [censored]!! They also told me over the phone to make sure I let my HD dealer know what Castrol is recommending?
Thank you for contacting Castrol.
Harley-Davidson recommends the use of their genuine oils at all times or, if not available, to use an SAE 20W-50, API SL/CF oil that meets their HD 240 (1996-2005 model year) or HD 360 (2006 and newer model year) ratings.
Although we have no doubt that our Power RS products will provide the required protection and performance in Harley-Davidson engines, they are not approved under HD 240 / HD 360 or claim API CF. Therefore, if a motorcycle engine is still under warranty, we recommend that only Harley-Davidson genuine oils be used.
Castrol Consumer Relations