Castrol GTX 20W-50 is an API SN/CF mineral engine oil designed to clean away old sludge* and protect against new sludge formation better at a rate that exceeds industry standards. Severe driving conditions like those found within major cities can cause the build up of the thick, tar-like substance. Sludge can block your engine’s vital oil galleries like cholesterol in an artery– and if untreated it can rob an engine of power and in severe cases can cause catastrophic engine failure. Help extend the life of your engine with Castrol GTX.
* Vs API SN Limits

Castrol GTX 20W-50 is suitable for use in automotive petrol and diesel engines where the manufacturer recommends an API SN/CF or earlier specification 20W-50 lubricant. To find the oil type and viscosity suggested for your vehicle; either add your vehicle to My Garage or check with your manufacturer, vehicle user manual, your local mechanic or head in-store and talk to one of our friendly team.