no extra fuel filters no additives just use the regular truck diesel i try to buy at places that sell to trucks hi flow pumps and its not stale i carry an extra 200litres on board gives me a range of about 2000kms safely i use the genuine fiat filter and change it every service the injectors have approx. 620000kms on them and still working well and its still using between a quarter and a half litre of oil between services cant complain with that scared to say its all going well Cheers Adam