[rightbyte]

I think it is good idea to delegate QA to shops. It aligns the incentives to don't sell me crap.

And I have no clue about what dishwasher is crap or not, and they do.

I wonder what amount of years would be good for an absolute guarantee. Maybe something like 10 years and then 5 years of some limited sort?

The guarantee probably need some odometer limit though to prevent commercial or multi housing usage on the long guarantee.