viscosity 5w-40

[v6dreamer]

my car is a adventure model 08 with a diesel engine, i bought it last end of april and im planning to use mobil delvac 1 fully synthetic kaya yung viscosity niya is only 5w-40, i don't know kung pwde gamitin to and yung viscosity naka lagay sa manual wala approved na 5w-40, help naman sa mga experts natin, thanks.

Go w/ the manual said.