Strictly Diesel OIL
Caltex Delo Gold Ultra 15w40
Shell Rimula X R4 15w40
In a highway cruiser with a multiple-dozen liter sump, why not? Even passenger cars are capable of 16k+ km nowadays.
i doubt that gold drain interval can be 50K in pakistan due to dusty conditions.
I think one zero is added at the end both for delo and rimula mileage. Even after removing zero, this mileage is on higher side in Paki environment.
BTW Im using Delo Gold and Gold Ultra for my diesel vehicles since many years and I change after every 3000 km.