Castrol 06091 SYNTEC FX 10W-40 Full Synthetic Motor Oil 1 Quart

The Castrol SYNTEC FX 10W-40 is an advanced full synthetic motor oil engineered to deliver superior protection for critical engine components. Its unique, proprietary SYNTEC Power Technology formula reduces oil volatility and provides outstanding wear protection across a wide range of operating temperatures and driving conditions.

Key Features:

• Full Synthetic Formula: Advanced full synthetic base oils deliver better protection than conventional motor oil
• Viscosity Grade 10W-40: Engineered for broad temperature range performance — flows readily in cold starts while maintaining protective film thickness at high operating temperatures
• Reduced Volatility: Proprietary formula minimizes oil burn-off and consumption, helping maintain consistent oil levels between changes
• Acid Neutralization: Helps neutralize engine-damaging acids that can cause rust and corrosion on cylinders, bearings, and hydraulic valve lifters
• Extreme Condition Stability: Maintains viscosity and film strength under high heat, heavy loads, and sustained high engine speeds where conventional oils can break down
• 1 Quart (32 fl oz): Single-quart container for top-offs or use as part of a full oil change

Castrol SYNTEC FX 10W-40 is suitable for use in gasoline-powered passenger cars and light trucks requiring a 10W-40 viscosity engine oil. It is compatible with previously used motor oils, making it an easy upgrade to full synthetic protection.