Castrol GTX is a trusted engine oil that protects against daily engine challenges. Its Double Action formula cleans existing sludge and prevents new sludge formation, exceeding industry standards to help extend engine life. Castrol GTX 5W-30 C4 is suitable for gasoline and diesel engines requiring an ACEA C4 5W-30 lubricant. It is approved for vehicles needing Renault RN 0720 and MB-Approval 226.51 specifications. This engine oil provides advanced protection against viscosity and thermal breakdown, and uses premium base oils and anti-wear additives to help minimize oil consumption. Specifications: ACEA C4, MB-Approval 226.51, Renault RN 0720.