use a good quality 15/40 turbo diesel semi syn oil.look for HD on the can.this stands for high detergent.castrol,comma,shell,or any well known brands make excellent oils.selenia can be expensive.and change the oil and filter every 3-5k.
I've always used DX3 from Partco, its the one in the red bottle. Specific to turbo diesels. Its got anti-foaming stuff in it. I think thats a lot like the HD sumpplug reccomends. As for capacity its a tad under 4.5 litres.