What grade is C3 engine oil classified as?
2 Answers
Diesel engine oil C3 is a standard set by the European Manufacturers Association. The C certification represents: Catalyst-compatible engine oils, designed for high-performance gasoline and diesel engines equipped with DPF (Diesel Particulate Filter) and TWC (Three-Way Catalyst). Currently, it mainly targets high-performance diesel engines with DPF particulate filters. Below is the classification of base oils: 1. Solvent-refined base oil: Solvent-refined base oil has a higher sulfur content and unsaturated hydrocarbon (mainly aromatic) content; 2. Hydrotreated base oil: Hydrotreated base oil has lower sulfur, nitrogen, and aromatic content; 3. Hydroisomerized base oil: Hydroisomerized base oil not only has low sulfur and aromatic content but also a very high viscosity index.
I found that C3 engine oil belongs to the mid-to-high-end category. Specifically, it is classified according to the European ACEA standard and is specially designed for modern high-performance gasoline and diesel engines. I usually drive a turbocharged car, and after switching to C3 oil, I noticed that the engine runs smoother, noise is reduced, and performance remains stable especially during long-distance driving. This grade of oil features a low-ash formulation, which protects exhaust systems like DPF particulate filters and reduces emissions to meet environmental requirements. Compared to basic grades like A3/B4, C3 has a longer lifespan, requiring replacement only every 10,000 to 15,000 kilometers. Although it's slightly more expensive, considering the enhanced engine protection and improved quality of life, I think it's well worth it. I recommend checking your vehicle's manual before purchasing to confirm compatibility before making the switch.
