Engine oils need to be able to constantly respond to the ever-changing environments in your engine. Every second of the drive your engine oil needs to be able to react to the needs of different metal-to-metal contact points in your engine each with different demands, pressures and temperatures. Castrol EDGE Extended Performance with Titanium FST provides unsurpassed protection for critical engine parts, ensuring optimal performance – with the strength to enable an extended drain interval of up to 15,000 miles. Independent testing has proven EDGE Extended Performance stronger than Mobil 1 Extended Performance against viscosity breakdown – the ultimate test of strength.