I don't think it's as simple as that.
For example, I run a diesel BMW. Yes, I know the timing chains are a potential weakness. But I also (from my work) am of a professional opinion that a lot of those problems are due to poor/infrequent servicing, and that BMW's standard 18k oil changes are far too infrequent. So I get the oil and filter changed every 9k miles. I've also taken the full BMW extended warranty, so if anything does go BANG then it's all going to be fixed by BMW at no cost to me.
'Argybargy' on here has a Ford powershift gearbox in a car. It's currently got problems, but he's running it under warranty too. Once fixed, he's stated he's likely to get rid before the warranty runs out. I suppose, if he wanted, he could enquire with Ford about the costs of extending the warranty on his car too.
So in both of those cases, we're mitigating or eliminating the risks that we know exist.
The problems come when people are buying those horribly expensive, prone-to-failure units at 6+ years old, when they've had poor maintenance (or no maintenance), and people don't do the research and know something about the potential pitfalls.
So, in one case (and the recent thread from the lady with the SEAT Leon DSG is a classic example) she'd bought the car, done no research at all, had no idea about DSG gearboxes (or t seemed, even what they were compared to TC or CVT gearboxes), and was seemingly oblivious. Hence virtually all of us, when the car had other problems and she was offererd a full refund, begging her to get rid of it.
She might have no problems at all. But if a trader's policy is simply one of "I wouldn't touch them out of warranty, too many problems to bite me on the backside", then it says a great deal.
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