The Haynes series of manuals are excellent for general maintenance. Information is included for major repairs and overhauls as well. Everything is covered from checking the oil to rebuilding the engine. No Mini Cooper owner should be without one.
This new manual from Haynes covers model years 2001 - 2005, including the Cooper One, Cooper & Cooper S Hatchback, including option packs 1.5 litre (1598cc) petrol and supercharged. Does NOT cover models with CVT automatic transmission or diesel engines, or features specific to Convertible or John Cooper ‘Works’ conversions.
Note that Haynes used a right hand drive car in the making of this manual. While some parts are in different locations than on a left hand drive vehicle, the underlying maintenance, repair and overhaul processes remain valid.