Yes , it has to be mineral based JASO FB spec .

Semi and synthetic FC and FD don't dissolve well in the fuel and are more expensive anyway .

The oil brings additional lubricity to the pump and detergents and dispersants to keep the fuel system clean .

Being a petrol additive it must burn like petrol so it's molecules are first to ignite under diesels compression ignition then the diesel molecules follow acting as a catalyst , so this reduces diesels ignition delay ( diesel knock ) thus improving the fuels Cetane number .

The results are , quicker starting particularly noticeable from cold , quieter smoother engine mostly noticeable at idle , less smoke out of exhaust as better combustion ( half's mot smoke opacity tests ) . Less carbon deposits in egr , intake manifold , turbo , etc .

Motor factor diesel 'Stop smoke' products are kerosene based again more ignitable than diesel .

More mpg , only a few .



10 Litre Diesel ---> 50 Ml.
20 Litre Diesel ---> 100 Ml
30 Litre Diesel ---> 150 Ml.
40 Litre Diesel ---> 200 Ml.
50 Litre Diesel ---> 250 Ml.
60 Litre Diesel ---> 300 Ml.
70 Litre Diesel ---> 350 Ml.
80 Litre Diesel ---> 400 Ml.
90 Litre Diesel ---> 450 Ml.
100 Litre Diesel ---> 500 Ml.


There's also 2-EHN a genuine cetane number improver .