What kind of engine oil is suitable for BJ40?
3 Answers
BJ40 is equipped with a turbocharged engine, and it is recommended to use fully synthetic engine oil with a viscosity of 40. Turbocharged engines have higher requirements for engine oil. More details are as follows: 1. Engine oil is known as the lifeblood of the engine. Inside the engine, it not only lubricates but also cleans, seals, cushions, dissipates heat, and prevents rust. Without engine oil, the engine cannot operate normally. During operation, the engine oil forms a thin film on the surfaces of various components, preventing direct contact and friction. 2. When selecting engine oil viscosity, it is essential to choose the appropriate viscosity based on your engine's technical characteristics. The viscosity of the engine oil should neither be too high nor too low. If the viscosity is too low, the oil cannot form a stable film inside the engine. If the viscosity is too high, it increases the resistance during engine operation, affecting power output and fuel economy. Generally, a viscosity of 40 is suitable for turbocharged engines. 3. Over time, the performance of engine oil deteriorates, so it needs to be replaced regularly. It is advisable to change the engine oil on schedule during regular use and replace the oil filter each time. When purchasing an oil filter, always choose genuine products from reputable brands.
I've been driving the BJ40 off-road for quite some time, and choosing the right engine oil is crucial, especially when you frequently tackle mountain trails or muddy terrains. The BJ40's engine is robust but needs proper oil protection. I recommend using 5W-30 full synthetic oil, such as Mobil 1 or Shell Helix Ultra. This type of oil ensures quick starts in cold weather and maintains viscosity under high temperatures, handling the harsh conditions of off-roading. For purely city driving, semi-synthetic oil is also fine—more economical and practical, just keep the viscosity consistent. In winter, stick with 5W-30, but switching to 5W-40 in summer might be better. Driving habits matter a lot: when I drive aggressively, the oil consumption increases, so I change it every 7,000 kilometers or so, checking the filter at the same time. The API standard should be at least SN-grade, and avoid cheap counterfeit products. Proper maintenance can extend the engine's lifespan by several years.
As a BJ40 owner, I prioritize cost-effectiveness and practicality, so I don't chase expensive engine oils. The manual recommends 5W-30 synthetic oil, and I find semi-synthetic domestic Kunlun oil works just fine, as API SN standard ensures basic performance. For city driving, 5W-30 is fuel-efficient enough—no need to switch to thicker oil in hot summers to avoid increased fuel consumption. Change it every 10,000 km, adjusting based on driving distance and road conditions; since I mostly drive on highways with stable oil quality, I can extend the interval slightly. The brand isn't crucial, but mainstream options like Great Wall Lubricant offer good value. Regular oil changes paired with filter maintenance are key—they protect the engine without extra costs. Don’t fall for marketing hype; standard synthetic oil fully meets daily needs.
