Not done an oil change on the 2.2 yet - I'll see if this one's the same after 10,000 miles from last service. I was thinking that carrying on with whatever it's used to would be logical, until I looked at the receipts I was given with It, e.g.:
Sterling Peugeot, Norwich 24/07/07
Esso/Mobil 5W40 1/10 SYNTS £46.08
Oil Filter £8.10
Housg Plug Se £0.94
5W40 1Litre T/UP SYNTS1 £9.75
Oil flush treatment FTF £12.15
Fuel Treatment Diesal FTD £12.15
Environmental disposal charge £4.26
Pollen Filter £12.74
Washer liquid £0.83
Labour P1 Service £61.08
Total, (wait for it) £195.21 with £31.92 discount!

Mind you it did also include a brake efficiency test, (£14.99) & Check tracking (all OK) £29.98