Hi, I changed the oil on the other halfs 2001 1.0 Micra the other week, both the filler and drain plugs undone without any problems (used a 10mm allen key on the filler). I replaced the oil with 2.5 litres as per the haynes manual. Since the change we have noticed that changing into first can sometime be difficult when cold. I have further read (on here) that some people fill up with 3 litres of oil or even mix 2.5 with .5 of engine oil. So, attempting to add more oil, I've hit a problem. I've tried the same allen key in the filler plug but this has unfortunately slipped and has now round off some of the plug. Can anyone advise me how to go about removing the filler plug, you help would be greatly appreciated.