I have read the entire recent thread on putting petrol into a diesel
engine. However that scenario was about 10% or less added.

Today my wife filled an empty tank in a diesel car completely with
unleaded petrol in error. The tank must be at least 90% petrol! Less
than one mile down the road the engine started juddering. She realised
her mistake and stopped and called the AA. They advised not driving any
further to avoid damage. The car was towed to a garage. They have said
that they will provide a complete report by friday - but that it will
involve a great deal of work - and the bill is liable to be thousands!

The car is a one year old mercedes cdi estate. Does anyone think they
could be right - or are they likely to be greatly exaggerating?

--
Matthew Barnard