Price per 500ml bottle. Please note that on most motorcycles you will require two of these bottles. Almost every enduro and motocross bike takes 5 weight fork oil. Most road motorcycles take 10 weight fork oil - in general
When should I change fork oil? What a lot of people don't realise is that fork oil nearly always needs to be flushed long before fork seals ever go on a bike. The fork oil works quite hard and picks up a lot of contamination from alluminium fork bushings and also dirt getting through the seals. It's difficult to answer as road and offroad differ along with their conditions but, as a rule of thumb, you should flush out motocross forks every 15 hours.