As vehicles age, they change and some of these changes can result in costly repairs or replacement. Catalytic converter failure is one of the most common – and costliest -- problems faced by higher mileage vehicles. The phosphorus in all motor oil anti-wear packages is also an industry recognized catalyst poison.

Castrol GTX High Mileage is specially formulated with less phosphorus than other leading oils, replacing it with advanced technology invented and patented by Castrol that helps prevent catalytic converter and emission system failure and delivers unsurpassed protection against sludge, wear and oil burn-off*
*vs leading conventional oils, 5W-30 tested

Castrol Engine Warranty Castrol GTX High Mileage protects your vehicle against oil-related engine damage. Register for your free Castrol Engine Warranty here:

Castrol GTX High Mileage 10W-30 exceeds manufacturer's warranty requirements for applications requiring API SN and ILSAC GF-5.

The 5 QT bottle is ideal for motor oil changes and easy storage.

To learn more about Castrol’s products and helpful tips, please visit

  • For cars with over 75,000 miles
  • Provides protection against sludge, wear and oil burn-off
Dimensions14.2 x 8.6 x 13.4 inches

Castrol GTX 10W-30 High-Mileage Motor Oil, 5 qt.


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