so for example, new ducati user manual says service must be done by authorized dealer. say you buy a new ducati and you changed oil yourself. you have receipts for factory the oil/filter you bought. within the warraty period the engine starts to leak oil from head gasket, or the engine blows up. you bring bike to dealer and dealer checks and goes "oh you didn't do first service here. it's your fault. warranty denied."
can dealer legally deny a warranty claim because you DIYed?
can dealer legally deny a warranty claim because you DIYed?