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Matt, Engineer
Category: Car
Satisfied Customers: 21496
Experience:  Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
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5th lost power eccsesive smoke and whent..revs..stall..engine oil

Resolved Question:

discovery d5 running ok while doing about 60 mph in 5th lost power eccsesive smoke and whent up to foll revs ,had to stall engine to stop , seems to have been running on own engine oil ?
any idears .
Submitted: 6 years ago.
Category: Car
Expert:  Matt replied 6 years ago.

two possible sources that the oil could have come from either the turbo or the crankcase breather system. from your description it sounds like it could well be a failed turbo as these tend to fail suddenly and there should be absolutely no radial play in the turbine bearings - axial / end float is OK but any radial play means a shot bearing.

If its the crankcase pressure relief valve (PCV) these are sprung loaded and are only meant to 'burp' excess pressure every now and then. The exiting gas is piped back to the inlet , however should the valve stick open then the engine tends to suck the air out of the crankcase all the time and this carrys oil over with it.

If you remove the air intake pipe and look inside where the crankcase breather is plumbed in you may find evidence of oil.

If you do find oil replace the valve.
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