>>/799151/
> way of reducing the warranty period if you don't use their crap. 
Some manufacturers have two warranty lanes is what I mean. One for everything through the dealership as an authorised work that is the longer period and the other is using your local mechanic without authorised parts for a shorter warranty period. 
But I think it is phasing out more, as other manufacturers are offering longer warranties with better conditions but something to be aware of when you see those long warranty periods that they hide these types of conditions everywhere.