Fully synthetic engine oils typically have longer oil change intervals, with significantly better chemical stability and high-temperature shear resistance than mineral oils and semi-synthetic oils. Taking Mobil 1 0W-20 SP grade as an example: it utilizes PAO base oil and advanced additive technology, enabling an oil change interval of up to 15,000 kilometres or 1 year. It is particularly suitable for China VI B-compliant vehicles and hybrid systems, demonstrating outstanding low-temperature starting performance (-35℃) and fuel efficiency (saving 0.3-0.5L per 100 kilometres). For German turbocharged vehicles or older cars with over 80,000 kilometres, Castrol Magnatec 5W-40's high-temperature oil film stability supports a 10,000-kilometre change interval, though a 20% reduction is recommended for southern China's high-temperature regions or aggressive driving conditions. Note that oil longevity is also influenced by driving patterns; frequent short trips accelerate oil acidification, necessitating earlier changes at 8,000 kilometres. When selecting oil, strictly adhere to the viscosity specifications in the vehicle manual (e.g., 0W-20 for Japanese/Korean models, 5W-40 for German vehicles), and purchase through authorised channels to avoid counterfeit products. Genuine fully synthetic oils will display certification marks such as API SP/SN or ACEA C2/C3 on their packaging.
