Description
Capacity: 1 litre (1 L)
BARDAHL 405039 – GEAR BOX SAE 10W-40 1 L
Bardahl Gear Box SAE 10W-40 is a gearbox oil for 2-stroke and 4-stroke motorcycles with a gearbox separate from the engine and a wet (oil-bath) clutch. Bardahl presents it as the ideal lubricant for 2T and 4T motorcycles, for smooth shifting and precise riding. It is designed for riders, on road and off road, and for motorcycle workshops.
What it is for
On motorcycles with a gearbox separate from the engine, the gearbox oil lubricates both the gears and the wet clutch. An unsuitable or degraded oil makes shifting hard and imprecise and causes the clutch to slip or stick. Gear Box meets the JASO MA/MA2 specifications, designed for wet clutches.
Benefits
- ✅ Smooth shifting for precise riding.
- ✅ JASO MA / MA2 specifications for correct wet-clutch operation, even in the most advanced systems.
- ✅ Extends clutch and gearbox life.
- ✅ Reduces effort for the rider, gearbox and clutch.
- ✅ Suitable for 2T and 4T motorcycles, on road and off road.
Dosage and directions
Use the quantity and change intervals given in the motorcycle's owner's manual. Drain the used oil from the gearbox completely and refill with Gear Box 10W-40 to the specified level. Before buying, check that the manufacturer specifies an SAE 10W-40 oil with JASO MA or MA2.
Technical specifications
- Bardahl code: 405039
- Product: Gear Box, motorcycle gearbox oil
- Viscosity grade: SAE 10W-40
- Performance level: API SL, JASO MA / MA2
- Size: 1 litre
- Application: 2T and 4T motorcycles with a gearbox separate from the engine and a wet clutch
Compatibility
Gear Box is intended for 2-stroke and 4-stroke motorcycles with a gearbox separate from the engine and a wet clutch, such as many motocross, enduro and trial bikes and scooters with a separate gearbox. It is not an engine oil: on 4T motorcycles where engine and gearbox share the same oil, use the engine oil specified by the manufacturer. For motorcycles with a dry clutch, follow the specification in the owner's manual.
When it is not enough: if the clutch still slips with new oil, or the gearbox jumps out of gear, the problem is mechanical (clutch plates, springs, shift forks) and should be checked by a workshop.
Pair it with
- Bardahl 101023 Fuel Injector Cleaner 300 ml, petrol injector cleaner
- Bardahl 118018 Top Gasoline + Hybrid 250 ml, petrol additive
Frequently asked questions
What is Bardahl Gear Box 10W-40 for?
Bardahl Gear Box 10W-40 is a gearbox oil for 2T and 4T motorcycles with a gearbox separate from the engine and a wet clutch. It gives smooth, precise shifting and extends gearbox and clutch life.
What specifications does Bardahl Gear Box 10W-40 meet?
Bardahl declares API SL and JASO MA / MA2 performance levels, with an SAE 10W-40 viscosity grade.
Is it suitable for motorcycles with a wet clutch?
Yes. Bardahl recommends it precisely for motorcycles with a wet clutch, and the JASO MA/MA2 specifications are designed for this type of clutch.
Can I use it as engine oil in my 4-stroke motorcycle?
Gear Box is a gearbox oil. On 4T motorcycles where engine and gearbox use the same oil, use the engine oil specified by the manufacturer. Gear Box is for motorcycles with a gearbox separate from the engine.
Is it suitable for 2-stroke motorcycles?
Yes. Bardahl recommends it for 2T and 4T motorcycles with a separate gearbox and a wet clutch. On 2T bikes the engine itself is lubricated with 2-stroke mix oil.
How often should motorcycle gearbox oil be changed?
Follow the intervals in the owner's manual. On off-road and racing motorcycles the change is usually much more frequent than on road bikes.
How much oil does my motorcycle gearbox need?
It depends on the model: many 2T motorcycle gearboxes take less than a litre. Check the quantity in the owner's manual. The 1-litre bottle is enough for most oil changes.
What is the difference between Gear Box and T&D Additive?
Gear Box 10W-40 is a complete gearbox oil for motorcycles, compatible with wet clutches. T&D Additive (140018) is an additive for gearbox and transmission oil and must not be used with wet clutches.
Why buy from Autoricambi Tritella
Since 2007 we have supplied workshops and riders through 4 stores in the province of Teramo, Italy (Giulianova, Mosciano Stazione, Roseto degli Abruzzi, Nereto). Genuine Bardahl products, fast shipping and technical support: if you are unsure which product suits your vehicle, contact us before buying.
Shipping, Returns & Warranty
- Shipping: 24/48h throughout Italy with tracking; delivery also available to other European countries.
- Returns: 30 days - product intact and in its original packaging.
- Warranty: 24 months - direct support from Autoricambi Tritella.
Always check compatibility using your vehicle identification number (VIN) or contact us for assistance.
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