Should You Change Engine Oil Based on Time or Mileage?
2 Answers
For conventional mineral oil, semi-synthetic oil, or full synthetic technology oil, the maintenance interval is generally 5,000 kilometers or six months. For full synthetic oil, it's 10,000 kilometers or one year, whichever comes first. Below is relevant information about vehicle maintenance: 1. Routine Maintenance: Typically refers to regular maintenance every 5,000KM (some models are 7,500KM). The maintenance generally includes changing the engine oil and oil filter, checking the fuel filter (many vehicles no longer have one), and air filter. If they are dirty, they can be replaced together. Additionally, it's essential to check whether the brake discs and pads need replacement, if brake fluid needs topping up, and the condition of the tires, which is crucial for safety. 2. Periodic Maintenance: Usually performed every three years or every 40,000KM. Besides routine maintenance, it also involves cleaning the fuel injectors, throttle body, and the vehicle's intake system. Furthermore, it requires replacing transmission fluid, front and rear axle oil, as well as coolant and brake fluid. The tire wear should also be checked, and tires replaced if necessary. 3. Major Maintenance: Generally occurs after the vehicle has traveled 100,000KM, involving a comprehensive inspection of the vehicle and replacement of parts as needed. At this stage, special attention should be paid to checking the wiring (electrical circuits) and transmission mechanisms.
I've been repairing cars for over a decade, and changing engine oil depends on both mileage and time. The oil in your engine is like blood - over time it accumulates metal particles and carbon deposits, so it naturally needs replacement when the mileage limit is reached. But even if your car sits unused, the oil still oxidizes and deteriorates, reducing its lubricating effectiveness. Manufacturers typically recommend changing oil every six months or 5,000 kilometers, whichever comes first. I've seen too many customers delay oil changes based on mileage, only to end up with sludge-clogged oil passages requiring major repairs costing tens of thousands. Regularly check your dipstick - if the oil appears dark and thickened, take action immediately. Don't risk major damage to save minor costs.
