Gen 2 service kits

That old chestnut

There will be many opinions. I use Motul 5100 15W/50 Semi and have done since the bike was new.

These engines were designed before the widespread use of fully synthetic oils and the component clearances make a semi synthetic more appropriate.

I have always used a 50 weight oil although some say a 40 is fine. Given the huge power pulses that come from the V twin I prefer to keep with the slightly heavier weight oil to help maintain the oil barrier layer intact.

There is a theory that you need to stick with whatever has been used before as mixing the use of semi and fully synthetic can cause problems with clutch plates. I cannot confirm or deny as I've always used the same oil but I've heard it from a number of sources so I would just keep using what you have been.