
Winter 10W-40, Summer 5W-30. Engine oil grades: SAE5W-30, SAE15W-40, SAE20W-50. Meaning of engine oil grades: The number before the hyphen in this grade indicates the low-temperature viscosity performance the oil meets in winter, while the number after the hyphen indicates the high-temperature viscosity performance it meets in summer. The smaller the number before the W, the better the oil's fluidity at low temperatures, making it easier to start the car. The larger the number after the W, the better the oil's viscosity in high-temperature environments, forming a stronger oil film. This type of oil can generally be used all year round.

I've been driving a Geely Free Cruiser, using 5W-30 engine oil as recommended in the manual. This grade ensures quick starts in winter and reliable performance in summer, keeping the engine running smoothly. I change the oil every 5,000 kilometers, and it's something you can do yourself. Just make sure to buy reputable brands like Shell or Castrol—don't cheap out with no-name products, as engine repairs can be costly. Also, remember to check the oil filter during changes; replace the old one to avoid clogging the oil passages. For daily driving, use the air recirculation mode, but switch to fresh air mode when the oil temperature is high to help with cooling—it saves fuel and maintains the car. Stick with this oil grade, and your car will run steadily with fewer issues.

Having driven for many years, I find that the Geely Free Cruiser works best with 5W-30 oil, which is perfectly suitable for temperate regions. The key is to check the API standard, such as SN or SP grade, to ensure good lubrication and engine cleanliness. Don't neglect the oil change interval—typically every six months or 7,500 kilometers—as oil turns black and loses efficiency over time. Daily oil level checks are simple: after parking, turn off the engine for five minutes, pull out the dipstick, and ensure the level is between min and max. Using full synthetic oil enhances protection, especially during long trips, reducing engine noise and boosting power. Setting the air conditioning to AUTO mode also helps regulate temperature, complementing oil maintenance for a worry-free experience. Maintaining these habits ensures your car stays durable.

When I first started driving, I knew nothing about engine oil. A friend recommended 5W-30 for my Free Cruiser, and after using it, the engine started quickly without any hesitation. The 'W' stands for winter low-temperature fluidity, and a smaller number means smoother starts. The manual also states that this grade is the safest. I change the oil every 6,000 kilometers, practicing by checking the oil dipstick myself—just top it up with fresh oil if it's low. For daily driving, I often use the air recirculation mode to save fuel, combining it with regular oil changes to keep the car stable. Remember to choose certified brands and don’t slack off.


