Castrol EDGE High Mileage 5W-30 Full Synthetic Motor Oil, 5 qt — Advanced wear protection & seal conditioner

Castrol EDGE High Mileage 5W-30 is a full synthetic motor oil formulated to protect and rejuvenate vehicles with 75,000+ miles while safeguarding the emission system.

If your car, truck, or SUV has accumulated high mileage, the right oil can reduce wear, limit leaks, and help maintain fuel efficiency. Castrol EDGE High Mileage 5W-30 uses a strengthened synthetic base and a tailored additive package that addresses the common mechanical and sealing challenges older engines face, including reduced oil consumption and deposit formation. It also includes technology designed to lower harmful phosphorus levels to better protect catalytic converters without sacrificing protection.

How does this oil protect older engines?

The formula prioritizes areas where wear and degradation typically appear in high-mileage vehicles: seals, internal friction surfaces, and deposit-prone regions. It forms a resilient film under pressure that helps control wear and guard moving parts while minimizing sludge and varnish buildup.

• Advanced full synthetic base for strong film strength under load
• Additives to reduce sludge and minimize deposit formation
• Seal conditioners to limit leaks and reduce oil consumption
• Engine test approvals to match OEM performance requirements

Will this oil help my car’s emissions system?

This variant incorporates phosphorus reduction technology to lessen the oil’s impact on catalytic converters and exhaust aftertreatment components. That makes it a better match for older vehicles that still rely on functioning emission hardware but need modern oil protection.

• Phosphorus Replacement Technology reduces harmful phosphorus content
• Formulated to protect catalytic converters and emission performance
• Helps prevent oil-related deposits that can impair exhaust systems

How often can I change the oil with Castrol EDGE High Mileage 5W-30?

Under typical conditions, Castrol specifies extended drain capability—up to the intervals they list—while always advising owners to follow vehicle manufacturer recommendations. The product is designed for long service spans, but environmental conditions and driving style will affect the exact interval.

• Rated for up to 15,000 miles between changes under ideal conditions*
• Or one year maximum, whichever comes first
• Always confirm intervals with your owner’s manual or service advisor

Which specifications and vehicles is this suitable for?

Castrol EDGE High Mileage 5W-30 meets a broad set of modern industry and OEM requirements, making it compatible with many late-model and older engines that call for a 5W-30 synthetic oil. Check your owner’s manual for the correct viscosity and spec to ensure compatibility.

• Meets API SP/SN PLUS/SN/SM and ILSAC GF-6 performance levels
• Meets Chrysler MS 6395, Ford WSS-M2C946-B1, and WSS-M2C961-A3
• Suitable for gasoline engines that require 5W-30 full synthetic oil

Who is this for? If your vehicle has crossed roughly 75,000 miles and you want an advanced full synthetic oil that focuses on reducing leaks, controlling deposits, protecting internal components, and being kinder to emission systems, Castrol EDGE High Mileage 5W-30 is engineered for that purpose. It fits drivers who prefer extended drain options while staying within OEM performance specs. Always verify the recommended viscosity and specifications in your vehicle manual before switching oils.

*Longer drain intervals depend on driving conditions and manufacturer guidance; consult your vehicle’s service recommendations.