Fox Racing
4wt Suspension Oil
Best maintenance fluid for mountain bikers seeking smooth, long-lasting suspension performance.
Keep your suspension system performing optimally with this essential 4wt Suspension Oil from Fox Racing Shox. Expertly formulated by a leader in suspension technology, this fluid ensures smooth operation and extends the lifespan of your components. It's the ideal choice for riders committed to peak efficiency and a consistently responsive ride. Maintain your bike's peak performance with this crucial maintenance fluid, designed for system longevity and smooth suspension action.
$31.99
Owner Satisfaction
4.5
/ 5
Category Rank
674
/ 2114
#674 in Components
Price vs Category Average
-69%
Below average
Viscosity Grade
4
/ wt
Who it's for
- Fox owners seeking factory-spec performance and warranty compliance
- Endurance riders needing consistent damping on long, technical descents
- Mechanics looking to maximize the longevity of internal suspension parts
Who should skip it
- Budget-conscious riders preferring cost-effective aftermarket alternatives
- Cyclists needing immediate access to parts at local bike shops
- Heavier riders requiring firmer damping support for aggressive terrain
Performance breakdown
Damping Consistency
Maintains predictable suspension behavior across a wide range of operating temperatures.
Seal Compatibility
Engineered specifically to preserve internal seals and prevent premature fluid degradation.
Friction Reduction
Advanced additives minimize stiction for a noticeably smoother and more responsive ride.
Component Longevity
Protects critical internal surfaces from wear during high-frequency compression cycles.
Viscosity Stability
Resists thinning under heavy load to ensure reliable damping performance throughout.
Maintenance Ease
Standardized formulation makes routine suspension service straightforward for home mechanics.
Key Specs
Viscosity Grade
4wt
Manufacturer
Fox Racing Shox
Product Type
Suspension Oil
Model Number
025-03-063
Features
- Maintains optimal suspension performance
- Formulated by trusted Fox Racing Shox
- Ensures smooth suspension operation
- Designed for system longevity
- Provides consistent performance
What customers say
Riders overwhelmingly praise the Fox Racing Shox 4wt Suspension Oil for delivering superior performance and reliability. The consistent viscosity ensures a noticeable improvement in ride quality, providing smooth and predictable damping essential for precise handling across varied terrain. As an OEM product, it guarantees perfect compatibility and maintains the factory feel of Fox suspension systems. While the initial cost is higher than generic options, users agree the enhanced performance and extended component lifespan make it a worthwhile investment for routine maintenance. This fluid is highly regarded as a premium choice that consistently meets the demands of serious riders.
Know before you buy
This oil is specifically formulated for use in Fox Racing Shox components that require a 4wt viscosity. Always check your specific fork or shock service manual to confirm the required oil weight before performing maintenance.
While it may function in other systems, it is best to use the oil weight and brand recommended by your suspension manufacturer. Using the wrong viscosity can significantly alter your damping characteristics and performance.
Fox generally recommends a full service, including an oil change, every 125 hours of ride time or once a year, whichever comes first. If you ride in muddy or dusty conditions, you may need to service your suspension more frequently to maintain optimal performance.
Yes, using the correct, high-quality suspension fluid like this 4wt oil is essential for reducing internal friction. It ensures your seals and bushings remain lubricated, which leads to a more responsive and supple ride.
This 4wt oil is primarily designed for use in the damper cartridge to manage rebound and compression. Refer to your specific service guide, as some Fox components require different types of fluid for the air spring chamber versus the damper.
Still have a question?
Ask Hayley anything about this product before you decide.