I'm gonna be "that" guy and ask about gearbox oil again. Looking to replace it again in my s13
First, the Internet rumours of gl5 breaking down syncro's? Is there any truth to it?
Second, I run redline mt90 gl4 75w90. The box feels notchy and generally like it doesn't want to sync. Is that to do with the oil (some Internet forums say redline is notchy) or my syncro on the way out?
Third, what oil would be good for my low powered, 25,000 mile s13? Want to try the redline lightweight shockproof but am abit put off by the gl5 rating
Cheers