What models does Dongfeng have? Trent TIIDA asks our predecessors, is SM/GF-3 5W-30 engine oil (Great Wall OEM) mineral or semi-synthetic? What kind of engine oil do people use? Toure Maintenance Exchange Sticker Li Wei Nissan&;s new car engine leaked oil, and the engine oil ran into the combustion chamber, and repeated maintenance failed. Is it true that Qi Dongfeng Nissan has 15 years of free maintenance for life?