Brand new RB25 big box notchy shifting in Drivetrain and transmission Posted October 7, 2021 Actually I mean this one, after a check. (the 90 was for the diff) 🤣 Is this bad? I was surprised to see the amount of tiny steel shavings when I drained it after about 150ks, due to the clutch balance problem. Since I do not race and I am not pumping high HP through, it is this oil a good choice and how often do I change it? We are only talking a few thousand ks a year.