How Often Should Fully Synthetic Engine Oil Be Changed?
3 Answers
Fully synthetic engine oil should be changed every 10,000 to 12,000 kilometers or every six months. If the operating environment is particularly harsh—such as high levels of dust, extremely low temperatures (below -20°C), or frequent short trips (each drive under 8 kilometers)—meeting any one of these conditions, it is recommended to shorten the oil change interval to every 7,000 to 8,000 kilometers. Fully synthetic engine oil refers to a high-quality lubricant made entirely from PAO (polyalphaolefin) or synthetic esters, typically labeled as "synthetic" on the oil container.
I've been driving for over 20 years and have some insights about the replacement intervals for full synthetic oil. Generally, manufacturers recommend changing it every 8,000 kilometers or six months, based on standard driving conditions. Since I do a lot of highway driving, I can often stretch it to 10,000 kilometers before changing. However, in city traffic with frequent stop-and-go or short trips, the oil degrades faster, so it's safer to reduce the interval to 6,000 kilometers. Before each oil change, I check the dipstick myself to see if the oil has darkened or become gritty with particles—this helps catch issues early. The advantage of full synthetic oil is its strong oxidation resistance and stable engine performance, which allows for longer intervals and saves money. But don't push it too far, or you'll risk engine wear and bigger losses. Remember, consulting the owner's manual is key, as requirements vary for different car models.
I enjoy doing car maintenance myself, and changing the oil is a regular task for me. I usually change full synthetic oil every 7,500 miles or so, referring to the owner's manual as a guide. High-quality oil can last up to 10,000 miles, but it's important to pay attention to driving habits—if you frequently drive in dusty or high-temperature areas, the oil degrades faster. Every three months, I check the oil level and test the oil quality using a dipstick. If the oil turns black or the viscosity drops, I change it ahead of schedule. This saves me money on repair shop fees, and all I need are basic tools, a safety helmet, and gloves. Full synthetic oil offers good durability, reduces engine noise, and is suitable for long-term use.
