The oil level is due to to many failed regeneration on the DPF. Not all cars were fitted with a warning light to tell you the DPF was regening. The early cars were but they changed in around 2006/7. Drop the oil to an acceptable level before you have a runaway engine with NO way of stopping it. Even with the ignition turned off they engine will carry on running at full RPM until it goes bang. Seen quite a few of these on the side of the road with the owners half a mile from the car while its revving its tits off filling the carriageway with black smoke.
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