I used shell x oil 15w-40 (5 litres). Checked again no oil leak i been in touch with my local garage who said its the Head gasket. I carn't believe the Head has gone from a simple oil/filter change.
wot oil do you recomend (focus mk1 tddi 1.8 2000 reg)
Old Ford diesels used this spec oil (well my old mondogger did) but as stated the newer TDDi and TDCi ONLY use 5W30 semi or fully synthetic. It wont have come down to selling you a dearer spec oil as 5W30 isnt that cheap for good quality Semi-synth. You'll be looking at about £35 for 5 litres.