Consistent Damping in Every Gallon
The 025-03-012 is a one-gallon container of FOX JM92 Advanced Suspension Fluid, a 4-weight mineral-based shock oil engineered for FOX shocks and other suspension systems that call for a 4W mineral fluid. This gallon size is built for shops and high-volume rebuilders who need enough fluid on hand for multiple shock services, full fluid changes, or fleet and race-team maintenance without running out mid-job. JM92 is formulated to hold a stable viscosity across a wide temperature range, so damping stays predictable whether the shock is working through rough terrain or long, sustained runs.
Key Features
- 4-weight (4W) mineral-based shock oil formulation
- Engineered for consistent damping and reduced fade at temperature extremes
- Stable viscosity across a wide operating temperature range, rated from roughly -70 to 400 degrees Fahrenheit
- Proprietary additive package reduces internal friction and foaming
- Anti-wear modifiers help reduce seal swell, oxidation, and corrosion
- Packaged as a full one-gallon (128 fl oz) container for shops and high-volume rebuilds
Fitment
| Year Range | Make | Model | Notes |
|---|---|---|---|
| N/A | Universal | Fluid / Consumable | Intended for FOX shocks and other suspension systems requiring a 4W mineral shock fluid; not tied to a specific vehicle |
Specifications
| Detail | Value |
|---|---|
| MPN | 025-03-012 |
| Product Name | FOX JM92 Advanced Suspension Fluid |
| Fluid Type | Mineral-based hydraulic/shock oil |
| Viscosity | 4W |
| Container Size | 1 Gallon (128 fl oz) |
| Operating Temperature Range | Approximately -70 to 400 degrees F |
| Composition | 80-89.99% highly refined petroleum (hydraulic) oil, 10-19.99% proprietary additives |
What’s Included
- One (1) gallon container of FOX JM92 Advanced Suspension Fluid
About FOX
FOX engineers suspension products and the fluids that keep them performing at their best. JM92 Advanced Suspension Fluid was developed alongside FOX suspension tuners and racing teams to meet the demands of modern off-road and motorsports shocks, and this gallon size makes that same fluid available in bulk for shops and dedicated rebuilders.
FAQ
What is the 025-03-012?
It is a one-gallon container of FOX JM92 Advanced Suspension Fluid, a 4-weight mineral-based shock oil for FOX shocks and compatible suspension systems.
What viscosity is this shock fluid?
It is a 4-weight (4W) mineral-based fluid.
How much fluid comes in this container?
This size is packaged as a full one-gallon container, equal to 128 fluid ounces.
What temperature range is this fluid rated for?
FOX rates JM92 for consistent performance across roughly -70 to 400 degrees Fahrenheit.
Is this fluid compatible with shocks from other brands?
FOX describes JM92 as suitable for FOX shocks and other suspension systems that call for a 4W mineral shock fluid, though it should always be checked against the specific shock manufacturer’s fluid recommendation.
Does this fluid carry a California Proposition 65 warning?
Yes, this product is sold with a California Proposition 65 warning; see the Prop 65 Warning section below for details.
Is this fluid compatible with natural rubber seals?
Third-party technical data for this mineral-based fluid indicates it is not compatible with natural rubber seals but is compatible with synthetic rubbers such as Buna, Viton, urethane, Teflon, and HNBR; confirm seal material compatibility for your specific shock before use.
Is the smaller quart size of this fluid the same formulation?
Yes, the quart-size JM92 fluid (025-03-011) is the same formulation, just packaged in a smaller container.
Install Instructions
- Disassemble the shock body per the applicable manufacturer service procedure and drain the old fluid completely.
- Clean internal components and inspect seals before refilling.
- Fill the shock body with FOX JM92 Advanced Suspension Fluid to the fluid level or volume specified by the shock manufacturer’s service documentation.
- Bleed air from the system per the applicable shock-specific bleeding procedure.
- Reassemble the shock and verify proper damping action before returning it to service.
- Store any unused fluid tightly sealed in a cool, dry location away from open flame.
Prop 65 Warning
This product can expose you to chemicals including mineral oil constituents, which are known to the State of California to cause cancer or reproductive harm. For more information, visit www.P65Warnings.ca.gov.
