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Amber liquid in a clear one-quart plastic bottle with a red Castrol GTX label

Castrol

Castrol GTX High Mileage 10W-30 Motor Oil 6450 1 qt

SKU CH-VZ6B-KE3DR

Synthetic-blend 10W-30 motor oil formulated for high-mileage gasoline engines, meeting API SN and ILSAC GF-5 standards

  • Protects older engines with GTX High Mileage formula
  • Flows at 10W in cold starts, holds 30 weight hot
  • Synthetic blend resists breakdown at 392 °F flash point
  • Meets API SN and ILSAC GF-5 gasoline standards
  • Low -32.8 °F pour point aids winter cranking

High-Mileage Synthetic Blend 10W-30

This one-quart bottle of Castrol GTX High Mileage motor oil uses a synthetic blend formulation rated SAE 10W-30. It is designed for gasoline engines with higher mileage that need wear protection and seal conditioning. The oil meets API SN and ILSAC GF-5 standards for modern engine requirements.

Viscosity Limits at Temperature Extremes

The oil maintains a viscosity of 68.81 cSt at 40 degrees Celsius and 11.7 cSt at 100 degrees Celsius, with a viscosity index of 151. It has a pour point of -32.8 degrees Fahrenheit for cold starts and a flash point of 392 degrees Fahrenheit for high-temperature stability. These figures define the practical operating window for the lubricant.

Bottle Design and Seal Compatibility

The product ships in a standard one-quart bottle with an amber-coloured fluid visible inside. The synthetic blend base is formulated to condition aging engine seals and reduce oil consumption in high-mileage gasoline engines. It is not suitable for diesel applications or engines requiring a different viscosity grade.

Highlights

  • Protects older engines with GTX High Mileage formula
  • Flows at 10W in cold starts, holds 30 weight hot
  • Synthetic blend resists breakdown at 392 °F flash point
  • Meets API SN and ILSAC GF-5 gasoline standards
  • Low -32.8 °F pour point aids winter cranking

Specifications

BrandCASTROL

Questions about this item

Should I choose the 1 qt bottle or a larger size for my high-mileage engine?

This listing is for the 1 qt bottle of GTX High Mileage 10W-30. Buy multiple bottles to reach the total capacity your engine requires, typically 4 to 6 qt for most gasoline engines.

What does the 10W-30 viscosity grade mean for daily driving?

The oil flows at a 10W rating in cold starts down to -32.8 °F and maintains a 30 weight at operating temperature, with a viscosity of 11.7 cSt at 100 °C and 68.81 cSt at 40 °C.

Which engine standards does this oil meet and what protection do they cap?

It meets API SN and ILSAC GF-5, covering deposit control, sludge protection, and fuel-economy requirements for gasoline engines.

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