Sorry to drag this old thread up but I am facing similar issues with my D5244T13. Deep engine note, almost blowy, poor MPG (e.g. on my 10 mile drive I lost 1.5mpg average from this tank of fuel and lost well over 100 miles of range).
The strange thing is this only happens when the engine is warm/hot but its frustrating as it doesn't happen all the time!
I can leave it for a few hours and come back to it and it will be fine. MPG and range will slowly recover, until it happens again.
I've just serviced it and it's currently on 193,000 miles. I have a new PCV valve ready to fit but taking out the dipstick briefly whilst engine running and having this problem makes no difference to the sound.
Any ideas if it still would be the tappets if the problem is intermittent like this?
Or is it the EGR valve?
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