First thing is to be certain if your car is 1st Generation (R50) or 2nd Generation (R56). Model Year 2006 was the last of the R50s. R56 MINIs start with model year 2007.
The R50 and R56 have similar looks but are completely different cars. The R50s use a engine supplied by Chrysler. R56s use a Peugeot/Citroen - BMW joint venture engine built by BMW.
If you are talking about model year 2006, the car is an R50. We own an R56. I don't have any personal experience with your car but Google found a DIY to reset the service indicator:
Google also found two DIYs on how to change the oil. Both have photos of the filter housing. Might be enough to help you find it.
Last edited by Andrew*Debbie; 12-23-2010 at 01:25 PM.