For Peugeot 806 it’s important to have optimal antifreeze inside. To maintain cooling system you need 9 liters of Red coolant. It’s better to choose fluid in combination of 1998 year, 2.0 volume of motor and engine code of RFU(XU10J2). Don’t underestimate the importance of Peugeot’s 2.0 engine cooling system. There is no chance 1999 806 engine will work efficiently with bad cooling.
It will be advantageous to follow Peugeot’s rules for 1999 806 service. 2.0 806 motors of 1999 year will serve more by optimal service. Better buy 8.5 liters of good antifreeze in Red color. There is an important thing for RFU(XU10J2) engines of Peugeot’s production – they expect good service.