Purpose and Specifications

Castrol 15B943 is a premium synthetic transmission oil designed for smooth gear shifts and long-lasting protection in automatic transmissions. This 5-liter canister delivers reliable performance in high-heat conditions up to 200°C while flowing easily down to -30°C for easy cold starts.

It meets ACEA C1 standards and STJLR.03.5005 specs, making it ideal for Land Rover, Jaguar, and Range Rover models from 2012-2025 with 2.2-4.4L diesel engines (150-340 hp). Practical benefits include reduced wear on clutches and gears, cleaner internals by resisting sludge, and extended fluid life up to 100,000 km or 5 years under normal driving.

When to Use / Replace?

• Install when: Equipping Jaguar XF, F-Pace, Land Rover Discovery, or Range Rover with compatible transmissions for smoother shifting and better fuel efficiency.
• Replace every: 60,000-100,000 km or 48 months, or sooner if towing heavy loads or driving in extreme temps to prevent harsh shifts and overheating.
• Shelf life: 5 years unopened when stored cool and dry.

FAQ

Is Castrol 15B943 suitable for my Land Rover Discovery?
Yes, perfect for 2012+ models with 3.0L diesel engines – ensures smooth operation and protects against wear.

Can I use it in cold climates?
Absolutely, flows smoothly at -30°C for reliable starts and gear engagement in winter.

How often should I change it?
Every 60,000-100,000 km or 4 years for optimal protection and performance.