e MT-85. It is the factory recommended weight. Redline just started to produce it within the last few years." is what I was told by Seb@SZ a few years ago. I tried it and never looked back since. I personally think it is a good move, as I didn't have the best of luck with MT-90. I never experienced any grinding or weird transmission stuff until I put a new fill of MT-90 in. It could have been a coincidence, but I remember seeing a few people mention that was their experience as well.