I'm hoping to do an oil and filter change this week but despite looking in the manual and previous posts I can't get clear info as to which oil to buy. I want to buy the best oil available within reason say up to £50.

The online Halfords and Castrol systems direct me to different oils, the Castrol site says Edge 5/30 but the halfords site says 10/40 oil for a PD engine which it isn't.

Can anyone advise me please?