What is the difference between C3 and C5 engine oils?
2 Answers
C3 engine oil can only be used for DPF and GPF in China V emission standards. For China VI emission standards, urea and DPF must be added on this basis, requiring the use of C5 engine oil. Below are the specific details: 1. Difference: ACEA C3 and C5 refer to the European automobile manufacturing industry's testing and certification standards for automotive lubricants. ACEA C5 is the highest grade in this series of standards, corresponding to the best oil quality and performance, while C3 ranks third in the grade. 2. Standards: The AECA C3 standard is higher than the API standard. AECA C3 oil is a top-tier low SAPS1 lubricant, mainly used for high-performance gasoline and light-duty diesel engines equipped with diesel particulate filters (DPF) and three-way catalysts (TWC), which employ advanced post-treatment systems. The ACEA C5 standard is higher than C3. Both standard oils have stable quality and long-lasting grade performance. ACEA C5 oil can also be used for high-performance gasoline and light-duty diesel engines equipped with DPF and TWC.
I often discuss car maintenance with my friends, and choosing the right engine oil is crucial. The difference between C3 and C5 oils mainly lies in their applications and performance. C3 is suitable for diesel vehicles equipped with particulate filters, as it reduces impurities and helps keep the emission system cleaner. C5, on the other hand, is a newer type that focuses particularly on fuel efficiency, reducing friction to make the engine run more smoothly, which is very practical for city driving. Having used both, I found that C5 can improve fuel efficiency by a few extra kilometers on highways, while C3 offers better compatibility with older vehicles. Overall, if your primary goal is fuel economy, C5 is the preferred choice; if your car has emission control equipment, C3 is safer and more reliable. It all depends on your car model and driving habits—don’t switch randomly to avoid engine damage.
