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As the old saying goes, when it comes to mountain bike suspension, there's more than one way to dig for money -- or in this case, tune a fork. Oil, springs, and shims all can be mixed and matched to change your fork's ride characteristics. Motorex Racing Fork Oil is a terrific option for riders looking to change the feel of their suspension fork or simply replace old fork oil. Oil serves two purposes in a suspension fork. First, it controls the movement of the wheel when it hits bumps -- we call this damping. Second, the oil provides lubrication for the fork's internal parts, protecting against friction and corrosion. And by changing the weight (viscosity) of your suspension fork's oil, you can alter how it performs on the trail. Higher weight oils (10W and 15W) are thicker -- they increase the fork's damping, providing slower movement over bumps in the trail. On the other hand, lighter, lower viscosity oils (2. 5W, 5W and 7. 5W) decrease a fork's damping. Motorex Racing Fork Oil features Low Friction Technology that prevents foaming and corrosion, while treating and protecting the fork's seals. It comes in a 1L bottle, enough for several applications.