In the booklet, BMW Bike Warranty guidlines, para 3 states
"If the servicing has been carried out by a non BMW Authorised Dealer then the Dealer reserves the right to reject any claim where it is felt that the cause of defect is due to use of a non genuine BMW part or inadequate servicing or repair by the non-approved Dealer"
Therefore, BMW accept that servicing may be carried out by non BMW Dealers and not invalidate your warranty as long as it is done to their standard. This is because they have to comply with October 2003 European Union legislation, ‘Block Exemption Regulations 1400/2002’ (BER) which, among many things, states
The BER covers service and maintenance during the warranty period and prohibits vehicle manufacturers’ warranties from including conditions requiring that:
· all normal maintenance be provided within the vehicle manufacturer’s network
· all parts used must be the manufacturer’s original spare parts
The European Commission declared that such clauses in a warranty document would represent ‘an unjustified restriction for the consumer’
So you don't even need to use genuine parts, just ones that are of the same standard.
So I'm keeping my extended warranty going but servicing will be done by a non BMW dealer, I'll use genuine parts cuz the cost isn't that different but I don't trust the workmanship (100 miles after my last BMW Dealer service the service light came on cuz they hadn't reset it. When I picked it up and remarked how dirty the new oil filter was they said that it had an 8 mile road test after, yet the technician never noticed the handlebars or on the pish and never commented/adjusted them)