Castrol EDGE High Mileage 5W-20 Full Synthetic Motor Oil, 4.73 L — Seal Conditioning & Emissions Protection

Castrol EDGE High Mileage 5W-20 is a full synthetic motor oil formulated to protect and rejuvenate engines with more than 75,000 miles while helping preserve emission-system components.

Designed for older engines, this advanced formulation blends Castrol's Phosphorus Replacement Technology with high-performance synthetic base oils and targeted additives to reduce leaks, control sludge, and minimize oil burnoff. It aims to maintain engine integrity, protect against wear, and support emissions hardware without sacrificing drivability. The 5-quart container provides enough oil for most modern gasoline engines needing a 5W-20 viscosity refill or top-up.

How does this oil protect high-mileage engines?

Castrol EDGE High Mileage 5W-20 includes additives that address common age-related engine issues like seal shrinkage, internal deposits, and increased wear. It helps condition seals, reduce oil consumption, and keep critical components cleaner so the engine runs more smoothly under everyday loads.

• Seal-conditioning agents to reduce leaks and drips
• Deposit-control chemistry to limit sludge and varnish formation
• Wear-reducing additives targeting timing and friction surfaces

Will it protect my catalytic converter and emissions system?

This formula uses Phosphorus Replacement Technology to lower harmful phosphorus levels that can damage catalytic converters over time. It also contains a proprietary additive package intended to be compatible with modern emissions equipment, helping extend the functional life of those components when used as part of regular maintenance.

• Reduced phosphorus content to limit catalytic converter stress
• Proprietary emissions-system protective additive
• Meets industry specifications relevant to emissions performance

How often should I change the oil when using Castrol EDGE High Mileage?

Castrol lists up to 15,000 miles between oil changes under appropriate conditions, or one year, whichever comes first, when service intervals and vehicle manufacturer guidance allow. Always follow your vehicle owner’s manual and local driving conditions; severe use or older engines may require shorter intervals.

• Manufacturer guideline: up to 15,000 miles or one year*
• Adjust intervals for towing, extreme temperatures, or dusty conditions
• Check oil level and condition periodically between changes

Which vehicles and specifications does this 5W-20 meet?

Castrol EDGE High Mileage 5W-20 meets a broad set of industry and OEM specifications, making it suitable for many gasoline engines requiring 5W-20 viscosity, including certain Chrysler and Ford applications. It satisfies API SP/SN PLUS/SN/SM and ILSAC GF-6 performance standards, along with specific manufacturer test requirements.

• API SP/SN PLUS/SN/SM and ILSAC GF-6 compliant
• Meets Chrysler MS 6395 engine test requirements
• Meets Ford WSS-M2C945-B1 and WSS-M2C960-A1 specifications

Who is this for: Castrol EDGE High Mileage 5W-20 is aimed at owners of gasoline-powered vehicles with over 75,000 miles who want a full synthetic oil engineered to address leak control, deposit reduction, wear protection, and emissions-system compatibility. It suits drivers looking for an advanced oil that supports longer service intervals when used according to manufacturer guidance, professional installers, and enthusiasts maintaining high-mileage sedans, crossovers, or light trucks that call for 5W-20 viscosity.

Features:

• Phosphorus Replacement Technology to help extend the life of the emission system
• Reduces leaks, oil burnoff and power-robbing deposits
• 15,000 miles between oil changes* (or one year, whichever comes first)
• Meets API SP/SN PLUS/SN/SM and ILSAC GF-6; meets Chrysler MS 6395; meets Ford WSS-M2C945-B1 and WSS-M2C960-A1

*Service interval depends on driving conditions and vehicle requirements; always follow the owner’s manual.