Rock Shox Suspension Oil Getting Oiled Up Just like you have to change the oil in your car, you'll want to change the oil in your mountain bike suspension so it can keep running smoothly. You don't want to put just any oil in your suspension, so make sure you refer to your suspension's manufacturer. The Rock Shox Suspension Oil is for use in all Rock Shox suspension forks. Refer to your suspension component's service manual for specified oil volumes and weights. Designed for Rock Shox suspension Available in 2. 5wt, 5wt, 10wt and 15wt | Rockshox | Suspension Oil 15 Weight, 32 Ounces