Turbo Diesel revs redline,can,t stop engine without stalling it???

[BIGGYIN]

Sorry it,s not an Audi,but it,s definately a classic.
1900(I think)TD Astra 1997year,it,s my Brother's.
I know there are some excellent mechanics(CREEP,CREEP)on here,I don,t know anything about turbo,s,let alone diesel turbo,s.Could someone help PLEASE.
Cars done about 190,000 mile.He put it into a garage in Germany,to have a new cam belt put on and an oil change.After that,every so often the engine would all of a sudden rev very high(lots of smoke) and doesn,t stop even if you switch the ignition off.Only way to stop it,is to stall it.(Not a sticking throttle cable)
Lately it,s been doing it more frequent.Now everytime he starts it,it does it ALL the time.
Don,t know anything about TD,s.
Could the wrong engine oil(as in synthetic)cause this,or could it be the turbo?Or both??
Thanks,Karl.

[msh]

Sounds like that new oil is coming through turbo into engine Or, in worst case, through crack in block or head.

[pimpdriver]

It is probably picking up the oil out of the sump. It needs sorting NOW.

I once saw a diesel car on the side of the motorway doing this. Revving it's tits off until all the engine oil was gone. Self destruct time.

[BIGGYIN]

Thanks,for your pointers.

[dest]

Taken from another site:

Diesel particulate filter (DPF)

The DPF is both passive and active. In passive mode it burns off particulates through heat generated by the engine and exhaust system, so will do this on fairly long motorway journeys at 2,000rpm-plus.

It also has an active function, where extra diesel is injected into the combustion chambers to create enough heat to burn off the particulates as it is exhausted.

If it doesn’t burn completely, the excess diesel sinks into the engine sump where it contaminates the lubricating oil and raises the level.

Since diesels are compression-ignition engines, once this level gets too high they will start running on their own lube oil and can only be stopped by stalling them or by stuffing the air intake with rags (which few people are willing to do against a raging engine).

[msh]

Car makers started to use DPF some years ago, that astra doesn't have one.