Lucas Oil Heavy Duty Engine Oil Stabiliser – 3.79 Litre (1 US Gallon)

SKU: 40002

Protect your heavy-duty vehicles, fleet, or high-performance motorsport builds with the workshop-sized 3.79 Litre (1 US Gallon) Lucas Oil Heavy Duty Engine Oil Stabiliser. Formulated as a 100% pure petroleum supplement, this industry-leading treatment is engineered to eliminate dry starts, drastically reduce friction, and control heat and wear across all engine types.

This large-capacity 3.79-litre bottle offers the best value for engine builders, professional garages, and those maintaining multiple vehicles or larger commercial and agricultural equipment. By significantly increasing the lubricity of your engine oil, it lowers operating temperatures, boosts oil pressure, and actively reduces oil consumption.

Because it is a pure petroleum product, Lucas Oil Stabiliser safely blends with all other automotive lubricants, including synthetic oils, mineral oils, and ATF (Automatic Transmission Fluid). It is equally effective in the drivetrain—use it in manual transmissions and differentials to stop leaks, control mechanical noise, and extend gear oil life. Whether you are preserving a worn engine or protecting a fresh, high-stress build, this is the ultimate mechanical problem solver.

Key Benefits:

• Workshop Value Size: Ideal for high-capacity oil systems, fleets, commercial use, and performance engine builders.

• Eliminates Dry Starts: Clings to internal components to ensure vital parts are fully lubricated prior to oil circulation.

• Extends Oil Life: Increases the working lifespan of your engine and gear oil by at least 50%.

• Reduces Oil Consumption: Thickens the oil seal in worn cylinders to minimise blow-by, oil burning, and leakage.

• Boosts Performance: Raises oil pressure, resulting in smoother power delivery and improved fuel economy (MPG).

• Drivetrain Protection: Controls noise, heat, and wear in manual transmissions and differentials.

• Universally Compatible: Safely blends with conventional, mineral, and fully synthetic oils.

• Warranty Safe: Will not void new car warranties when used as directed.

• Emissions & Gearbox Safe: Compatible with Diesel Particulate Filters (DPF) and safe for Limited Slip Differentials (LSD – use a 10% ratio).

• Safety Data Sheet: Click to Download

Directions for Use:

For standard engine oil applications, replace 20% of your total system capacity with Lucas Oil Stabiliser.

• High-Capacity Example: When filling a 19-litre system (typical in heavy-duty or commercial applications), use one full 3.79 Litre bottle of stabiliser alongside 15.2 litres of standard engine oil.

For heavily worn engines, manual transmissions, or differentials, please refer to the product label for specific application treat rates.

Supplied as a single 3.79 Litre (1 US Gallon) bottle. 355ml (12 fl oz) and 1 Litre (33.8 fl oz) bottles also available.