Castrol GTX 5W-30 C4 4L Synthetic Technology Engine Oil for Diesel Engines with DPF

With a pour point of -36°C and ACEA C4 certification, Castrol GTX 5W-30 C4 delivers dependable cold-start protection and after-treatment compatibility for modern diesel engines. This 4-litre container of synthetic technology oil is engineered to meet the stringent requirements of Renault RN 0720 and MB-Approval 226.51, ensuring optimal performance in vehicles equipped with diesel particulate filters.

Overview

Castrol GTX 5W-30 C4 is a low-SAPS lubricant formulated with synthetic technology to provide robust engine cleanliness and wear protection. Its advanced additive package keeps particulate filters and catalysts efficient, reducing the risk of blockages and maintaining emission compliance over extended drain intervals. The 5W-30 viscosity grade offers excellent fluidity at low temperatures, promoting faster oil circulation during cold starts and reducing engine wear during the critical warm-up phase.

What stands out

• Meets ACEA C4 specification for low-SAPS performance in diesel engines with DPF
• Approved by Renault (RN 0720) and Mercedes-Benz (MB 226.51)
• Excellent cold-start protection with pour point down to -36°C
• High thermal stability with flash point above 190°C
• Robust anti-wear and deposit control for extended engine life
• Compatible with modern diesel engines requiring ACEA C4 oils

Technical details

• Viscosity grade: 5W-30
• ACEA specification: C4
• API specification: SN/CF
• Volume: 4 litres
• Oil type: Synthetic technology
• Low SAPS: Yes
• Manufacturer approvals: Renault RN 0720, MB-Approval 226.51
• Application: Diesel engines with Diesel Particulate Filter (DPF)
• Container type: Plastic bottle
• Flash point: >190°C
• Pour point: -36°C
• Density @ 15°C: 0.85 g/cm³
• Kinematic viscosity @ 100°C: 11.5 mm²/s
• Kinematic viscosity @ 40°C: 68 mm²/s
• Sulphated ash: Max 0.5%
• Total Base Number (TBN): 6.0 mg KOH/g

Our verdict

Castrol GTX 5W-30 C4 is a trustworthy choice for owners of modern diesel vehicles requiring ACEA C4 lubricants. Its low-SAPS formulation protects emission control systems while delivering strong engine protection across a wide temperature range. Backed by key manufacturer approvals, this oil offers peace of mind and performance in a convenient 4-litre pack.