How many kilometers can semi-synthetic engine oil run?

[LaKimberly]

Semi-synthetic engine oil is usually replaced every 7,500 kilometers or 7-8 months. Here is a detailed introduction about automotive semi-synthetic engine oil: 1. Overview: Semi-synthetic oil (Semi-Synthetic-Lubricant) is one type of automotive engine oil. It is made using semi-synthetic base oil, specifically: internationally classified Group III base oil, which is a refined product derived from mineral oil through hydro-cracking technology. 2. Others: The function of engine lubricating oil is to lubricate and clean the engine. It can be divided into three types: mineral oil, synthetic oil, and semi-synthetic oil. Semi-synthetic oil is a mixture of mineral engine oil and full synthetic engine oil in a ratio of 4:6.

[AndersonRose]

I usually drive an older Japanese car, and if using semi-synthetic oil, it's generally safer to change it every 6,000 to 7,000 kilometers. It mainly depends on driving conditions: frequent traffic jams in the city lead to higher engine temperatures and faster oil degradation, so you should pay attention around 5,000 kilometers; if you drive more on highways, the oil performs better and can last up to 7,500 kilometers. Once, I didn't change it on time, and the oil turned black and thick, engine noise increased, and fuel consumption went up. Later, an inspection revealed carbon buildup, costing me a lot more in repairs. Regular maintenance can extend engine life—don't try to save small amounts of money. In hot weather, oil oxidizes faster, so change it a bit earlier; in cold weather, it lasts longer. Compared to full synthetic oil, semi-synthetic is cheaper but requires more frequent changes. I recommend following the manual's recommendations but being more conservative—don't exceed 8,000 kilometers to avoid issues. Regularly check the dipstick yourself; if the oil is dark or has impurities, it's a sign it's time for a change.

[VanGrant]

As a cost-conscious car owner, I find it most economical to change semi-synthetic oil every 6,000 to 7,500 kilometers. Changing too early, like every 5,000 km, is wasteful and costs more; delaying beyond 8,000 km risks oil breakdown and engine damage, doubling repair costs. Based on my calculations, for monthly driving of 2,000 km, I recommend checking oil quality every three months—light yellow means it's still usable, black means it's time to change. City driving accelerates sludge buildup, so reduce the interval to 5,500 km; smooth highway driving can save you one oil change. Always record the mileage after each oil change and don’t exceed the manual’s limit. Oil quality matters too—brands vary significantly, so choose reputable ones. This approach protects your car and saves money, proving highly cost-effective long-term.

[SanJack]

I insist on changing semi-synthetic oil every 6,000 kilometers—safety first. Aged oil has poor lubrication, increasing engine component wear and risking breakdowns mid-drive. A friend delayed until 10,000 km, resulting in engine overheating and an 8,000+ CNY overhaul. Timely changes prevent oil film rupture under high temperatures, safeguarding engine longevity. Driving habits matter—harsh acceleration accelerates oil degradation. Quick check: monthly dipstick inspection—if oil is dark black or smells pungent, act promptly. Don’t gamble; road safety outweighs cost savings.