Check fuel filter as they changed in 2003 - some in engine bay and bigger diameter than the under rear wheel arch ones.
I'm sure that's where I got the oil in the picture. I think it was £12 for 5 litres, which is a bargain.Never thought of ASDA doing oil.
All modern oils will far exceed the old spec listed for the FL1, so as long as you get oil where the spec letters are higher, it'll be fine.I'm told that as long as it meets the spec, as in, the numbers on the rear as well as the front your good to go.