anyone use k&n 174c filter with shell rotella t6 oil? i have used rotella and the k&n filters on all my other bikes since getting to az in 97 do 100 daily never a proplem but they were all non HD bikes.
K&N filters let alot of fine particles by it. Even more so in the desert climate with fine sand particles. IMHO you would be better running the Sceamin Eagle dry media washable filter that requires no messy oiling and filters better than the K&N.
The oil viscosity requirement for the VRSC is 20w-50. The manual says you can use the oil you mention if the proper oil is not readily available. But it's your bike so knock yourself out.
Heres my two cents on filters and oil for what its worth. Ive used the Mobil 1 20-50 since I purchased it several years ago with a HD oil filter. The Mobil 1 is usually fairly priced and readily available at the local big box auto parts stores in my area. I never bought into the Amsoil thing. Ive always liked OEM filters, whether its Motorcraft for my GT500, or AC / DELCO for my Duramax. I never had a engine issue with OEM filters. Im not a big fan of the K&N air filters just due to the fact there oiled. I went to a dry filter from S&B and a dry Airaid filter for my Chevy and Mustang. I dont like the mess of oil residue in the airbox or maybe getting on the MAF. I was tempted to buy the SE dry filter since It seems the Amsoil filter is discontinued however, I havent done the research yet to see if the dry filter flows anyless then the K&N does. Currently, I still have the K&N in the bike that I bought a few years back when I went topless. Back then K&N was my only option.