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  5. High Mileage motor oil

High Mileage motor oil for cars over 75,000 miles

Advanced full synthetic and synthetic blend formulas engineered for high mileage engines.

Vehicles with more than 75,000 miles may experience increased oil consumption, aging seals, and deposit buildup. Castrol® High Mileage motor oils are specially formulated to address these issues and help keep your engine running smoothly.
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Our High Mileage motor oils

Protection tailored for vehicles with 75,000+ miles 

As engines age, their protection needs change. Explore Castrol High Mileage motor oils designed for advanced performance, full synthetic protection, or dependable everyday care.

Castrol GTX High Mileage

For drivers looking for everyday high-mileage protection in a synthetic blend formula. Featuring superior dispersancy that helps fight sludge buildup.

Castrol GTX Full Synthetic High Mileage

For drivers seeking enhanced high-mileage protection with a full synthetic formula. Delivering exceptional oil burn-off protection that exceeds industry standards.*

Castrol EDGE High Mileage

For drivers who want maximum performance and advanced protection for a high-mileage engine. Providing protection for up to 15,000 miles between oil changes.**

*As tested in the industry Sequence IVA wear test. Oil burn-offprotection based on API and ACEA volatility specifications.

**As measured in the Sequence IX test under high load/torque conditions vs. API SP limits. Protection lasts for up to 15,000 miles or one year, whichever comes first.

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Why choose Castrol high mileage?

High Mileage motor oil does more than provide everyday engine protection. Castrol high mileage formulas include specialized technologies that target key areas of performance. Here’s how those benefits help protect your engine and emissions system over time.

Phosphorous replacement technology

Helps extend catalytic converter life and protect your emission system, supporting long-term emissions system performance.

Seal conditioners

Seal conditioners

Helps prevent oil leaks from aging gaskets and seals, promoting cleaner engine operation as vehicles age.

Reduced burn-off

Specialized additives to reduce oil consumption in aging engines, providing consistent protection between oil changes.

Superior in 7 areas†

Key performance areas include: Protection against corrosion, sludge, timing chain, friction wear and more!

†versus industry standards

How to choose the best motor oil for high mileage vehicles?

The best motor oil for a high mileage vehicle is one that meets the viscosity grade and specifications recommended by the vehicle manufacturer while providing added protection for an aging engine. When comparing High Mileage motor oil options, consider whether a full synthetic or synthetic blend formula best fits your vehicle and driving habits. Castrol offers three options for vehicles with more than 75,000 miles: Castrol EDGE High Mileage, Castrol GTX Full Synthetic High Mileage, and Castrol GTX High Mileage. Each engine oil is formulated to help address concerns such as leaks, oil burn-off, deposits, and emissions system protection.

 

Pro Tip: If you are learning how to change the oil yourself, check your owner's manual before purchasing engine oil. Always use the viscosity grade and specifications recommended by your vehicle manufacturer, even when switching to a high mileage formula.

 

Frequently asked questions

High Mileage motor oil is specially formulated for vehicles with more than 75,000 miles on the odometer. It contains seal conditioners to help prevent leaks, detergents to reduce deposits, and Phosphorous Replacement Technology to help protect the catalytic converter and emission system. 
Castrol offers three High Mileage motor oils: Castrol EDGE High Mileage, an advanced full synthetic formula for drivers who demand maximum performance; Castrol GTX Full Synthetic High Mileage, a full synthetic for enhanced protection and affordability; and Castrol GTX High Mileage, a synthetic blend. All three oils are specially formulated for vehicles with more than 75,000 miles on the odometer. They are formulated to reduce burn-off and include seal conditioners to protect against leaks. It's Castrol's Phosphorous Replacement Technology that provides a unique benefit — a patented additive that reduces the level of harmful phosphorus, a known poison to the catalytic converter, helping to protect the emission system and extend the life of your car. 
The commonly adopted industry definition of 'High Mileage' is an engine that has more than 75,000 miles on the odometer — and most vehicles on the road today fit the high mileage profile. A High Mileage motor oil provides benefits focused specifically on the conditions that aging engines encounter. These specialized lubricants contain higher levels of detergents and seal conditioners to help protect aging seals and gaskets from becoming brittle, improved oil burn-off protection for engines where oil consumption has increased over time, and are completely suitable for newer engines too. 
Castrol EDGE High Mileage is an advanced full synthetic formula for drivers who demand maximum performance, with up to 15,000 miles between oil changes (0W grades; or one year, whichever comes first). Castrol GTX Full Synthetic High Mileage is a full synthetic formula that provides enhanced protection against extreme internal temperatures. Castrol GTX High Mileage is a synthetic blend that Includes specialized additives to reduce leaks, oil burn-off and power-robbing deposits. Use the Castrol Oil Selector to find the right grade for your vehicle. 
We always recommend following your vehicle manufacturer's recommendation for viscosity grade. Manufacturers will never call out 'High Mileage' within their oil recommendation — their recommendations are issued when the vehicle is new, not updated as the engine ages. A full synthetic oil that meets the manufacturer specification requirements can always be used in a high mileage vehicle. For the best of both worlds, select a full synthetic High Mileage Oil — such as Castrol EDGE High Mileage or Castrol GTX Full Synthetic High Mileage — which carries the performance advantages of full synthetic technology alongside the specialized additives of a high mileage formulation.
Yes. Castrol EDGE High Mileage, Castrol GTX Full Synthetic High Mileage, and Castrol GTX High Mileage are all available in 5W-30. Always follow your vehicle manufacturer's recommended viscosity grade. Use the Castrol Oil Selector to confirm the right oil for your car. 
Castrol offers three High Mileage motor oils: Castrol EDGE High Mileage, an advanced full synthetic formula for drivers who demand maximum performance; Castrol GTX Full Synthetic High Mileage, a full synthetic for enhanced protection and affordability; and Castrol GTX High Mileage, a synthetic blend. All three oils are specially formulated for vehicles with more than 75,000 miles on the odometer. They are formulated to reduce burn-off and include seal conditioners to protect against leaks. It's Castrol's Phosphorous Replacement Technology that provides a unique benefit — a patented additive that reduces the level of harmful phosphorus, a known poison to the catalytic converter, helping to protect the emission system and extend the life of your car. 
The commonly adopted industry definition of 'High Mileage' is an engine that has more than 75,000 miles on the odometer — and most vehicles on the road today fit the high mileage profile. A High Mileage motor oil provides benefits focused specifically on the conditions that aging engines encounter. These specialized lubricants contain higher levels of detergents and seal conditioners to help protect aging seals and gaskets from becoming brittle, improved oil burn-off protection for engines where oil consumption has increased over time,and are completely suitable for newer engines too.
This section is provided for general informational purposes only. Oil change procedures vary by vehicle make, model, engine type, and year. Always follow your vehicle manufacturer’s owner’s manual and recommended service procedures. If you are unsure or uncomfortable with motor oil selection, consult a qualified automotive professional.

Related links

Oil viscosity chart – motor oil grades

Oil viscosity chart – motor oil grades

Viscosity is the resistance to flow of a fluid. Motor oil viscosity grades are based on a scale developed by the API (American Petroleum Institute) lubricant organization. The values are defined in a specification known as API 1509 and are based on the resistance the oil gives to flowing at two different temperatures – cold and high temperature.
Comparing the types of motor oil

High Mileage motor oil

Castrol High Mileage motor oil lowers phosphorus to protect catalytic converters, adds seal conditioners, and offers GTX and EDGE formulas for older vehicles.