What is the best viscosity grade of oil for modern hi-rpm CRDI diesel engines?

the one recommend it in the owners manual.





30+ years Mechanic for a outstanding living.


diesel and gas engines.


master certification (in both autos and trucks)


shop owner (ten mechanics in the floor ,4 of them females)What is the best viscosity grade of oil for modern hi-rpm CRDI diesel engines?
Dello 400. 30wt. Any auto parts store that sells oil should have it.What is the best viscosity grade of oil for modern hi-rpm CRDI diesel engines?
Commons or Havoline 15W-40
The one it recomends in the owners manual.!!!!!

blemishes