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Rated 4.9 ★ by Real Riders
Rated 5/5 based on 1000+ reviews
Fox JM92 Advanced Suspension Fluid
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Fox JM92 Advanced Suspension Fluid
Mineral Type | 4W Shock Oil
Fox JM92 Advanced Suspension Fluid is a premium 4-weight mineral-based shock oil engineered for consistent damping, reduced fade, and long-term reliability in high-performance suspension systems.
Developed to meet the demands of modern off-road and motorsports shocks, JM92 delivers stable viscosity across a wide temperature range, helping shocks maintain predictable performance whether you’re pushing hard in rough terrain or logging long trail miles. Its advanced formulation reduces internal friction and protects critical components, extending service life and preserving ride quality.
Ideal for use in Fox shocks and compatible suspension systems requiring a 4W mineral shock fluid, JM92 is trusted by professional builders and performance enthusiasts alike.
Key Features
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4W Mineral-Based Shock Oil
Designed for precise damping control and consistent feel. -
Thermal Stability
Maintains viscosity under heat to reduce fade during aggressive use. -
Reduced Internal Friction
Promotes smoother shock operation and improved response. -
Component Protection
Helps extend seal and internal component life. -
Performance-Proven Formula
Suitable for high-performance off-road and motorsports suspension applications.
Specifications
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Type: Mineral shock fluid
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Viscosity: 4W
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Application: Suspension shock absorbers
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Compatibility: Fox shocks and other systems requiring 4W mineral shock oil
Trusted Suspension Performance
When precision and consistency matter, Fox JM92 Advanced Suspension Fluid delivers the performance and protection your suspension system depends on.
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Receive it on 02/06/2026
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Questions?
Answers here.
What makes SDG spring kits different from stock springs?
SDG spring kits use race-proven dual-rate designs tuned for your exact model. They restore ride height, improve comfort, and eliminate bottom-outs — the same setups used by championship race teams.
Do bundles qualify for financing?
Yes. SDG offers “Ride Now, Pay Later” financing for all complete systems.
What’s included in the SDG suspension bundle?
Each bundle includes SDG spring kits, reservoirs, clevis & shaft upgrades, and sway bar or limit strap options — all tuned to work as one system.
Do SDG spring kits fit both 2-seat and 4-seat models?
Yes. Each kit is vehicle-specific and includes the correct rates and preload setup for 2-seat or 4-seat configurations. Just select your model at checkout.
Do I need to revalve my shocks after installing a spring kit?
Not usually. Our spring kits are tuned to work with stock valving, but a revalve can enhance performance if you’ve added major weight like cages or accessories.
What does the SDG reservoir do?
The SDG reservoir increases nitrogen volume and reduces internal pressure buildup. It prevents heat fade, oil foaming, and premature seal wear — keeping shocks consistent in long desert or dune runs.
What do the SDG clevis and shaft upgrades improve?
They increase durability and smooth travel by using precision-machined materials that resist deflection. It’s a race-grade upgrade for consistent handling.
Do spring hats help ride quality?
Absolutely. By maintaining consistent geometry, they prevent unwanted spring movement and reduce top-out harshness.
Why upgrade the shaft if my stock one isn’t broken?
Stock shafts can flex or score over time. Our race-grade shafts maintain tight tolerances and reduce internal wear — keeping damping consistent.
Rated 4.9/5 on 
google
Jason was nothing less than awesome in helping me with my shock problem. From taking my phone call directly, listening to my situation, and ultimately hooking me up with the repair I needed he went above and beyond what you would expect. I can honestly say that after my experience at SDG I won't trust anyone else with servicing my shocks.
Jaimes McKinney 
Verified Customer
Verified Customer
These guys are awesome. Tod is such a stand-up guy. Thanks man.
@VFATAL Verified Customer
Amazing customer service! Highly recommended them for UTV shocks
@VFATAL Verified Customer
“Professional service, Very informative and quick turn around. I test drove my RZR PRO R and it rides awesome 👌 Thanks SDG”
@VFATAL Verified Customer
Best shock tuning in the industry!
@VFATAL Verified Customer
Mucha rapidez en su servicio exelente trato
@VFATAL Verified Customer
