Surprisingly, they are no more to keep on the road than a premium German motor. Annual servicing cost me about £500, assuming nothing needed replacing, tax was heavy at £480 p/a and insurance was about £400. Some consumables are very expensive - they eat clutches so you'd be better replacing with a twin plate clutch which will last significantly longer. 4.3 vs 4.7, big difference. If you're on a budget then do what I did, buy an early 4.3 and have the exhaust mod done at Bamford Rose, which upped the output to 420, which it needs. Don't get me wrong, it's a very quick car in any guise, but you need to be in the right gear at the right time in a 4.3. The 4.7/BR mode car has just that little more Tq which makes all the difference.
I would buy another in a heartbeat, as there is nothing that makes me feel quite as good as popping down the shops for a paper and returning 2 hrs later.....having emptied the fuel tank. It is a thirsty beast though, I averaged 16mpg over my ownership.
I don't buy the interior comments. It's a very pleasant place to be, and the dials are a work of art. What they lack is any decent tech, but as mine wasn't my DD, I never found it a problem.
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