I use Castrol GTX 10w-50 in my Triumph Daytona (for sale) with no issues. I changed my oil ritually @ 2k miles and replaced the filter with a K&N oil filter. I have never used and, as of right now, would not recommend any additives not recommended or suggested by the manufacturer.

I would not recommend Fram oil filters to a dead man. Yamaha's OEM filters are high quality and will either use those or K&N when I get my FJR in the spring.