I used millers cro 5w40 mineral oil and changed it at 50,100,200,500,1000 and switched to millers fully synthetic 10w60 for 6000 miles...
Just bought all millers stuff. Steven878 thats excessive changes isnt it? I couldnt find any 5-40 CRO running in oil they only had 10-40
10w40 will be fine mate. i did go a bit excessive with the oil changes, but I wanted to make sure everything was spot on, so I changed the oil and filter and checked for glitter while running in my £5700 engine