Actually, the issue isn't reliability, it's about risk. Common Rail diesel engines bring with them a high cost of repair, regardless of failure rate ('reliability') - which notably also can INCREASE with lower usage. 6,000 miles a year - at say 25mpg is 240 gallons of petrol. If the equivalent diesel did 35mpg, that's around 69 gallons a year saving. Less than £400? One EGR gummed up through lack of usage would soon eat into that budget - let's hope the DPF (if fitted) doesn't clog! I'm not against diesels, Common Rail, or high mileage - my car has almost 300,000km on the clock, but I do >40,000km a year. To me, a £1,500 turbo failure would be nothing more than 'routine maintenance' - because it's amortised over the high mileage I do. Given the budget, I very much doubt the OP with a limited budget would welcome a £1,500 repair bill! It's a risk which can be mitigated by choosing a petrol.
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