Castrol ON EV Transmission D2 15F21B - Premium Synthetic Transmission Fluid

Purpose and Specifications

Castrol ON EV Transmission D2 15F21B is a full synthetic transmission fluid engineered specifically for electric vehicle transmissions. This premium-grade fluid delivers superior protection and performance in modern EV powertrains, which operate under unique thermal and mechanical demands compared to traditional combustion engine transmissions.

Key Performance Benefits:

• Optimized for electric vehicle transmission systems with precise viscosity control for smooth gear engagement
• Enhanced thermal stability maintains consistent fluid thickness across wide temperature ranges, from cold starts to peak operating conditions
• Superior anti-wear protection reduces friction between transmission components, extending component lifespan
• Excellent low-temperature fluidity ensures responsive shifting even in cold weather conditions
• Full synthetic formulation provides extended drain intervals compared to conventional fluids

When to Use and Replace

Always consult your vehicle's owner's manual for the exact replacement schedule, as EV transmission fluid intervals vary by manufacturer and driving conditions. Most modern EV transmissions require fluid checks every 40,000-80,000 km or annually, whichever comes first. Under severe driving conditions—frequent rapid acceleration, towing, or extreme temperatures—more frequent inspections may be necessary.

This fluid is designed to operate effectively between -40°C and +100°C, making it suitable for year-round use in most climates. The 5-liter container provides sufficient capacity for most transmission service intervals.

Frequently Asked Questions

Q: Can I use this fluid in a traditional automatic transmission?
A: No. This fluid is specifically formulated for electric vehicle transmissions. Using it in incompatible systems may cause performance issues. Always use the fluid type specified in your vehicle's manual.

Q: How long does an unopened bottle last?
A: Properly stored, unopened synthetic transmission fluid maintains quality for 3-5 years. Store in a cool, dry location away from direct sunlight and extreme temperatures.

Q: What happens if I mix this with other transmission fluids?
A: Mixing different transmission fluid types can compromise performance and damage your transmission. Always drain the system completely before switching fluid types, or use only the manufacturer-recommended fluid.