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Amber liquid in a 1 qt plastic bottle with Castrol GTX High Mileage 5W-30 label

Castrol

Castrol GTX High Mileage 5W-30 Motor Oil 1 Qt

SKU CH-D9XT-1XEVY

Synthetic-blend engine oil formulated for high-mileage gasoline engines, meeting API SN and Ford WSS-M2C929-A standards in a one-quart bottle

  • GTX High Mileage formula protects older gasoline engines
  • Synthetic blend base meets API SN and ILSAC GF-5 standards
  • SAE 5W-30 viscosity grade suits wide temperature ranges
  • Viscosity index 159 indicates stable thickness across heat cycles
  • Ford WSS-M2C929-A and WSS-M2C946-A approvals confirm OEM compatibility

Engine oil for high-mileage petrol cars

Castrol GTX High Mileage 5W-30 is a synthetic-blend lubricant formulated for gasoline engines with higher odometer readings. It meets API SN, ILSAC GF-5 and Ford WSS-M2C929-A plus WSS-M2C946-A specifications. The 1-quart bottle suits top-ups between service intervals.

Simple pour-in installation with minimal risk

Installation consists of removing the filler cap and pouring the required volume; no tools or special procedures are needed. The only common issue is over-filling, which can raise crankcase pressure and cause leaks or seal damage. Always verify the level with the dipstick after filling.

Stable viscosity during extended running

The oil delivers a viscosity index of 159 with kinematic viscosities of 66.4 cSt at 40 °C and 11.7 cSt at 100 °C, indicating consistent film strength as temperatures rise. A flash point of 392 °F and pour point of -32.8 °F support reliable protection during prolonged high-load operation and cold starts alike.

Highlights

  • GTX High Mileage formula protects older gasoline engines
  • Synthetic blend base meets API SN and ILSAC GF-5 standards
  • SAE 5W-30 viscosity grade suits wide temperature ranges
  • Viscosity index 159 indicates stable thickness across heat cycles
  • Ford WSS-M2C929-A and WSS-M2C946-A approvals confirm OEM compatibility

Specifications

BrandCASTROL

Questions about this item

How can I confirm the oil is performing correctly after an oil change?

After installation, check the dipstick level, verify the amber colour is clean, and monitor for low-oil-pressure warnings; the oil meets API SN, ILSAC GF-5, Ford WSS-M2C929-A and Ford WSS-M2C946-A specifications.

What comes in the package and what must I purchase separately?

The package contains one 1-quart bottle of GTX High Mileage 5W-30 synthetic-blend engine oil; an oil filter, drain-plug washer and funnel are not included.

Which viscosity grade should I select for a high-mileage gasoline engine?

Choose the 5W-30 grade listed — SAE 5W-30 with a viscosity index of 159, 11.7 cSt at 100 °C and 66.4 cSt at 40 °C — as it matches the manufacturer highlights for high-mileage gasoline engines.

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