Thought I'd add my (recent) experience here, though I don't know iof anyone's still reading. I've read the same story so many times: a whistling noise coming from somewhere (seems innocuous enough unless you know about cars) that rises and lowers with acceleration and only when in gear. Then, the next day, smoke pouring from the engine having struggled up an incline on the M40, one stranded (and very unhappy) wife. Engine carried on running even without ignition. RAC man said it was the turbo (he was correct). It seems we were lucky: helpful local mechanic has replaced the turbo and cat and all SEEMS fine, though we're now on tenterhooks in case anything else happens. The engine seems to have survived: apparently the turbo impeller had come off its bearings but it had not disintegrated sending shards of metal into the engine. The exhaust and intercooler were full of oil but, once drained out and dried, the smoke has stopped. Renault serviced it themselves back in May (we're still within the period before next service stated on the stickerthey stuck on the windscreen). The thing is, for such a catastrophic failure, there was little warning (just the whistling), no oil warning light, nothing. We're pretty angry and £1,000 down. Has anyone else taken advice on this? Would be interested to swap stories.