My Fizzer has 25,000 miles on it and I was wondering if it's that wise to use relatively thin fully synth in it. I've always used Halfords mineral in most of my other bikes because they were low revvers but I'm not sure about the FZR. If the tolerances aren't as tight as they were from new, then the extra viscosity of a lower spec oil would help the engine out surely?
Not sure on this one. I think mineral or semi is the way to go. Whadda you lot reckon?