Red Line 58409 Lightweight ShockProof® Gear Oil - 946ml
Specialist Red Line synthetic competition gear lubricant for suitable racing transmissions, dog-ring gearboxes and moderately loaded racing differentials requiring high gear-tooth protection with comparatively low fluid drag.
Lightweight ShockProof® uses Red Line's unique suspension of microscopic solid particles to provide a combination of low friction and exceptionally strong gear-tooth protection. The lubricant behaves much like a liquid grease, cushioning loaded gear teeth while resisting being thrown away from critical contact surfaces.
Red Line describes Lightweight ShockProof® as providing a film thickness greater than an SAE 75W140 gear oil while producing fluid friction similar to an 80W gear oil or 30W motor oil. This makes it particularly useful in competition drivetrains where both protection and reduced parasitic drag are important.
Typical applications published by Red Line include Hewland and other road-racing dog-ring transmissions, Bert and Brinn stock-car transmissions, G-Force and Liberty clutchless drag-racing gearboxes, and moderately loaded racing differentials.
- Product type: Specialist synthetic competition gear lubricant
- Product range: Lightweight ShockProof®
- Brand: Red Line Synthetic Oil
- Product reference / SKU: 58409
- Container size: 946ml / 1 US quart
- Primary applications: Racing transmissions and moderately loaded racing differentials
- Transmission applications: Dog-ring and suitable clutchless competition gearboxes
- Lubrication system: Primarily wet-sump / splash-lubricated drivetrain systems
- Film thickness: Greater than SAE 75W140
- Fluid friction: Similar to approximately 80W gear oil / 30W motor oil
- Coefficient of friction: Approximately 40% lower than conventional gear oils according to Red Line
- Load-carrying capability: Approximately 250% of conventional gear oils according to Red Line
- Performance benefit: Helps cushion gear teeth and reduce tooth breakage under extreme pressure
- Cold performance: Excellent low-temperature flow and improved cold shifting
Fitment advice: Lightweight ShockProof® is a specialist motorsport lubricant and should be selected according to gearbox or differential design rather than conventional viscosity grade alone. Confirm suitability for the specific transmission or differential before use.
Typical racing applications: Red Line specifically cites Hewland and other road-racing dog-ring transmissions, Bert and Brinn stock-car gearboxes, G-Force and Liberty clutchless drag-racing transmissions, and suitable moderately loaded racing differentials.
Pumps, coolers & filters: Red Line states that Lightweight ShockProof® can be used with pumps and coolers when an inline screen is used instead of a fine filter. Avoid pumping the lubricant through the centre of a main shaft because the suspended ShockProof® particles may centrifuge out of solution.
Other items to consider: When servicing a racing gearbox or differential, you may also want to consider replacement drain and fill plug washers, gearbox or differential seals, breather components and related drivetrain service parts where required.
Useful tools / consumables: Fluid transfer pump or filling bottle, drain pan, suitable sockets or spanners, torque wrench, protective gloves and workshop towels.
Difficulty guide: DIY Difficulty: Moderate to Advanced. Filling the unit may be straightforward, but correct lubricant selection is particularly important because Lightweight ShockProof® is a specialist competition product rather than a conventional universal gear oil.
Why Red Line? Red Line Synthetic Oil is known for high-performance lubricants, fluids and additives developed for demanding road, track and motorsport use. Red Line products are chosen by enthusiasts and workshops for their focus on protection, thermal stability, shift quality, friction control and application-specific performance.
What’s in the bottle: One 946ml / 1 US quart bottle of Red Line Lightweight ShockProof® Gear Oil.
Service notes: Drain the existing lubricant and refill to the gearbox or differential manufacturer's specified level. Confirm the unit's compatibility with ShockProof® technology before use, particularly where pumps, coolers, filters or specialist lubrication circuits are fitted.
| Make | Model | Sub Variant | Chassis / Code | Years | Power (PS) | Engine Codes | Fuel | Transmission | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Universal | Competition / specialist vehicles | Dog-ring / clutchless racing transmission | — | — | — | — | — | Racing gearbox | For suitable Hewland and other road-racing dog-ring transmissions, Bert / Brinn stock-car gearboxes, and G-Force / Liberty clutchless drag-racing transmissions. |
| Universal | Competition / specialist vehicles | Moderately loaded racing differential | — | — | — | — | — | Differential | For suitable moderately loaded racing differentials and wet-sump / splash-lubricated competition drivetrain applications. |
| Vehicle Manufacturer | OEM Reference / Specification |
|---|---|
| Red Line | 58409 — Lightweight ShockProof® Gear Oil, 946ml / 1 US quart UK/European reference |
| Red Line | Current US quart reference: 58404 |
| Red Line | Film thickness greater than SAE 75W140 with fluid friction similar to 80W gear oil or 30W motor oil |
| Red Line | Approximately 40% lower coefficient of friction than conventional gear oils |
| Red Line | Approximately 250% of the load-carrying capacity of conventional gear oils |
| Red Line | Recommended for suitable moderately loaded racing differentials |
| Red Line | Popular in Hewland and other road-racing dog-ring gearboxes, Bert and Brinn stock-car transmissions, and G-Force / Liberty clutchless drag-racing gearboxes |
| Red Line | Excellent low-temperature flow and improved cold shifting |
| System note | Can be used with pumps and coolers when fitted with an inline screen rather than a fine filter; avoid pumping through the centre of a main shaft |
| Universal application | No direct vehicle-manufacturer OE replacement reference; specialist competition transmission / differential lubricant |