I'm sorry I do not write French. I'm doing the Saviem TP3 reconstruction and after 10 months working on caroserie and electricity I'm going for the first long ride (300km) I need to replace the motor oil. The current is 14 years old. Jaký typ mám zvolit? In documentation i see 20W-40 for temp above -5°C. Is possible use oil 10W-40? What are you using? Thanks for the answers.