I think something similar applies in many parts of the world, _but_ I also think that the response from the OEMs is basically "fight the warranty claims hard when there is third party service involved, and just honor the warranty with a smile otherwise". Basically malicious compliance is what they have to resort to. And as a car owner I'm lazy and afraid of conflict. So I happily pay X% more for the service to get the no fuss warranty (And the OEM shop is even happier).