Castrol® GTX® High Mileage 5W-30 is the #1 consumer high-mileage brand of motor oil.  It's a synthetic blend engine oil that helps extend the life of engines by protecting against sludge, wear and burn-off.  Engineered with Phosphorous Replacement Technology, it also protects emission systems by replacing some of the phosphorous that can damage catalytic converters.   Meets or exceeds the following specifications: API SP/SN PLUS/SN/SM, ILSAC GF-6, Meets Ford WSS-M2C946-B1, Meets Ford WSS-M2C961-A1
- Phosphorus Replacement Technology helps extend emission system life 
- Superior dispersancy that fights sludge build up 
- Exceptional oil burn-off protection exceeding industry standards* 
- Seal conditioners to help reduce leaks 
- Advanced additives that minimize engine wear 
- Improved fuel economy**