Lucas Oil Synthetic SAE 75W-90 Gear Oil 1 Gallon — High-Temp Thermal Stability & EP Protection

Lucas Oil 10048 Synthetic SAE 75W-90 Gear Oil is a heavy-duty, high-temperature synthetic gear lubricant formulated to cushion gears, resist squeeze-out under extreme pressure, and retain lubricity when conditions get hot.

Built for demanding differentials, manual transmissions and gear sets, this Lucas Oil synthetic gear oil uses a specialized additive package to protect gear teeth from metal-to-metal contact and to remain effective at elevated temperatures. Its formulation focuses on extreme-pressure resilience and thermal stability, so it keeps working where lesser lubricants thin out or fail. The product comes in a convenient 1-gallon container for shop use or fleet servicing.

How does this gear oil protect gears under extreme pressure?

The oil contains robust extreme-pressure (EP) additives that cushion gear surfaces and prevent direct metal contact when loads spike. That additive chemistry reduces wear during shock loads and helps prevent pitting and scoring on gear teeth.

• Special additive package designed to resist "squeezing out" under pressure
• Formulated to maintain a lubricating film during high-load events
• Reduces wear and extends gear life in demanding applications

Will it hold up at high operating temperatures?

This synthetic SAE 75W-90 is engineered for thermal stability, so it resists thinning and preserves lubricity when gearboxes run hot. Consistent lubricating properties at high temps help maintain reliable shifting and torque transfer.

• Synthetic base oils selected for high-temperature performance
• Additives that prevent viscosity breakdown under heat
• Suitable for applications where temperature control is a challenge

Which vehicles and components are best suited for this oil?

Lucas Oil 75W-90 synthetic gear oil is appropriate for many manual transmissions, differentials and transaxles that specify SAE 75W-90. It’s a practical choice for heavy-duty trucks, off-road vehicles, performance cars, and fleets that demand durable protection.

• Manual gearboxes and limited-slip differentials (where specified)
• Commercial and heavy-duty vehicle drivelines
• Performance and off-road applications needing robust EP protection

How should I use and store the 1-gallon container?

Use standard service procedures for draining and refilling gearcases, following the vehicle manufacturer’s capacity and change interval recommendations. Store the sealed gallon upright in a cool, dry place away from direct sunlight to maintain additive effectiveness.

• Follow OEM viscosity and specification guidance before use
• Keep container sealed until ready to dispense to avoid contamination
• Dispose of used oil per local environmental regulations

Who is this for? Mechanics, fleet managers, off-road enthusiasts and performance drivers who need a durable synthetic gear lubricant will benefit from Lucas Oil 10048 SAE 75W-90. It’s made for anyone seeking heavy-duty, high-temperature gear protection in a ready-to-use 1-gallon supply—especially where extreme pressure resistance and thermal stability are priorities.

• Heavy duty
• High performance
• Stands up to high temperatures