In my view, it all depends on the areas covered by the approved car warranty.
Back in Dec 2014, I bought a 58 plate Cooper S from a Mini dealer, with the Approved Mini warranty. They knew the car, its history and provided me with proof the turbo water pump recall had been carried out, and the original as built spec sheet. FSH too.
Six weeks later car develops bad misfire, was towed in to local Mini agent, and two days later the diagnosis is broken piston. It was at this point I thought 'this is when you find out how cast-iron the Mini warranty is' as the synopsis was new short engine.
The approved Mini warranty covered the full cost of the short engine, labour, new water pump, gaskets, etc, etc. The also did a decoke as head was clogged, which was fault of previous owner and too many short journeys. Dealer invoice was £6,600, though my Plan B in case it wasnt a warranty job was a used lump from a breaker, and a friend's garage to fit.
Cannot fault the Mini warranty. Was put in a rental car day car was accepted at dealer - 3 series for the first five days, then a Megane once we knew the timescal for repairs. Was kept regularly informed of progress too.
Eight months on, car using water, and thermostat housing leaking as was new water pump. Again, warranty covered it all with a hire car. Only niggle was that Mini thermostat housings were scarce and on back order and I had to really push to get dealer to find one as I wanted to sell the car - company car had arrived.
One reason I chose a car with the Mini warranty was that the liability is the value of the car - in my case £7,800. Other warranties (non-franchised dealers) are less comprehensive covering £1,000 parts and labour if you are lucky - which doesnt go far on a modern car.
I'd have no hesitation about buying a car with a manufacturer warranty on the same liability limit as BMW/Mini, rather than a limited liability. Whether other warranties are as comprehensive is debatable. Some warranties are not worth the paper they are printed on, as this forum has shown.
Also, the change in consumer law giving the right of rejection or that a major fault was considered developing or present up to 6 months is added assurance in a way.
Wife has an Approved Used Mini too, and in 11 months, one fault, repaired under warranty, no problem.
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