Purpose and Specifications

Castrol 15D987 is a reliable mineral-based gear oil in 85W-90 viscosity, perfect for protecting manual transmissions and limited-slip differentials in cars and trucks. This 1-liter bottle delivers smooth gear shifts, reduces wear under heavy loads, and handles operating temperatures from -20°C to 130°C without breaking down.

It meets API GL-5 standards for extreme pressure protection and ZF TE-ML specs, ensuring long-lasting defense against rust, corrosion, and foam in differentials and gearboxes. Ideal for everyday driving and towing, it keeps components running cool and efficient.

When to Use / Replace?

Use this oil in limited-slip differentials on vehicles from Europe, America, Japan, and Australia. Replace every 40,000-60,000 km or 24-36 months, or sooner if towing heavy loads or in dusty conditions. Shelf life is up to 5 years unopened in a cool, dry place.

Practical benefits:

• Flows easily in cold starts for quick protection
• Stays thick during hot highway runs or off-road stress
• Prevents squeals and chatter in limited-slip setups
• Cuts maintenance costs with proven durability

FAQ

Is Castrol 15D987 safe for my limited-slip differential? Yes, it's specially formulated with additives to eliminate noise and wear in limited-slip diffs on most passenger cars and light trucks.

How often should I change this gear oil? Check your owner's manual, but typically every 40,000-60,000 km or 2-3 years under normal use; more frequently for severe duty like towing.

Will it work in high-heat conditions? Absolutely, it maintains protection up to 130°C, perfect for summer hauls or heavy commercial use.