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Helpful ReplyHuge oil smoke from exhaust

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Yorkiepud86
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2021/07/25 20:03:03 (permalink)

Huge oil smoke from exhaust

Hi everyone...my 991.2 Carrera T went to the OPC after developing an oil issue . This started with a puff of white smoke after accelerating out of a corner, and then sustained flames from the exhaust (friend following behind said it looked awesome!!). Immediately after, the oil level indicated none was left in the car, so it was trailered back to OPC by Porsche Assist. Long story short, they replaced the oil lines and turbos - suspecting a non return valve had failed on the oil pipe to the turbos (apparently a known issue??) - all done under warranty.
 
1100 miles later and zero issues...until yesterday. After some highly 'spirited' driving, we pulled over to stop. Fans kept running to cool the engine even after turn off (ambient temp was circa 18c, and oil and water were in the 95c range). Came to start it up 45 minutes later and a massive puff of white smoke from the exhausts - couple of revs cleared the smoke out. Oil reading was full at the start of the day (just below max) and now indicated it needed 1.3 litres of oil, but was still above minimum. Tried to see if the issue replicated, drove again, then stopped, waited and restarted - same smoke (video this time).
 
Someone I was with suspected that the oil is passing the o rings when the engine is too hot - and to leave the engine running for a few minutes first to allow the engine to cool itself more gradually to prevent this. Topped up with 1 litre of oil this morning, stated up with no smoke, drove it for 30 mins stopped for 15 and then restarted and again no smoke. Hence, thinking the 'hot engine' theory could be correct. 
 
I've called OPC to arrange it to be looked at again, but fear they will just be guessing.
 
Any thoughts or guidance would be greatly appreciated. 
Dave jones
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Re: Huge oil smoke from exhaust 2021/07/25 20:35:37 (permalink)
Very possible to be a turbo problem 
Yorkiepud86
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Re: Huge oil smoke from exhaust 2021/07/25 21:35:33 (permalink)
Dave jones
Very possible to be a turbo problem 


Thanks! Turbos both replaced along with all the oil lines about 8 weeks / 1000 miles ago. 
Carlton
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Re: Huge oil smoke from exhaust 2021/07/25 22:46:57 (permalink)
Yorkiepud86
Hi everyone...my 991.2 Carrera T went to the OPC after developing an oil issue . This started with a puff of white smoke after accelerating out of a corner, and then sustained flames from the exhaust (friend following behind said it looked awesome!!). Immediately after, the oil level indicated none was left in the car, so it was trailered back to OPC by Porsche Assist. Long story short, they replaced the oil lines and turbos - suspecting a non return valve had failed on the oil pipe to the turbos (apparently a known issue??) - all done under warranty.



This happened to me last Friday. I was attending a PCGB CAT driving training event. I was only on the 2nd activity in the morning. (It should have been a full day event, gutted I could not continue to participate. At least they have offered me 1/2 price fee to attend again).  I Had small but notable plume of white smoke 1st then a bit later a massive cloud of smoke, it would have been great for James Bond but not for me. No warning lights, except checked the oil level and only a 1/4 left. Earlier that day it was full.  Contacted Porsche recovery to get the car transported back to my local OPC. Bit of a traumatic experience I got home 10 hours later from calling Porsche recovery. (I was only 2 hours from home) The car had to be relayed on 3 separate recovery lorries! The car is now waiting for investigation at my local OPC. I suspect the turbo related failure however did not notice lack of power after the 1st plume of smoke expect for a few seconds after the smoke. Fortunately the car is under Porsche warranty.  Hoping the amount of oil been burned off has not damaged the cylinders etc.  
post edited by Carlton - 2021/07/25 23:04:04

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Yorkiepud86
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Re: Huge oil smoke from exhaust 2021/07/26 10:22:39 (permalink)
I know that feeling!! Fortunately I was only 2 hours from home.
 
I also had no loss of turbo boost pressure. Power felt fine and other than the no oil warning light, no other warnings. The turbos were changed preventatively considering they were unlikely to have been fed oil correctly so would have been a ticking time bomb for failure. 


Apparently the non return valves on the turbo oil pipes is covered by a “technical advisory”- ie not a recall, but a known issue. It might be worth you mentioning that to the OPC. They sent mine back after 3 days as they couldn’t see an issue. Following that I took videos of the smoking exhaust and recorded the oil consumption for about 2 weeks / 250 miles. They then had it for another 5 weeks to diagnose and fix (along with getting Porsche Germany to sign off on warranty work). 
Motorhead
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Re: Huge oil smoke from exhaust 2021/07/26 13:26:08 (permalink) ☄ Helpfulby Yorkiepud86 2021/07/26 19:23:10
Chaps,
 
Beside the potential turbo bearing oil starvation issue mentioned, dumping fair amounts of burnt oil in the exhaust won’t have done the cat converters much good … maybe something worth mentioning to your dealers re potential long-term warranty issues?
 
Jeff

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Carlton
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Re: Huge oil smoke from exhaust 2021/07/30 14:54:48 (permalink)
A very brief update!. Car was inspected today, All I could get out of the Service assistant assigned to my car is that replacement turbos have been ordered, needing to be replaced as there is oil in the pipes. ( I could have told them that!).
When I asked the question have the turbo none return values failed or is there damage to the turbo fins or casing she did not know, when I asked what about damage to the cat converters due to the amount of burnt oil (just about a whole reservoir of oil burned off) that has been put though the Cat converters, no mention that these will be replaced as part of this incident.     However I would also assume that Porsche would provide recommendations on the parts also needing to be replaced in circumstances like this?

So if they don't replace the cat converters and in a few years later  the car its fails it MOT due emissions.  Assuming the car is still with Porsche warranty would these be replaced as part of the warranty?  I can only assume that they will only fix things that are broken and not take a proactive approach. 

Also due to short staff (Covid) the car is booked in not until the 2nd week in Sept! So at this rate I might not get the car back until Oct!!!! 

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Motorhead
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Re: Huge oil smoke from exhaust 2021/07/30 16:29:56 (permalink)
Carlton,
 
With due respect to service assistants, in general I wouldn’t say they’re necessarily the best people to field technical queries such as yours … as you’ve found! Probably better to speak to the service manager direct?
 
In terms of any long-term warranty issues with the cat converters, if you have the extended warranty you’d have to look at the exclusions, but if you’re still under the factory warranty I would imagine that discussion would need to be conducted with the factory via your dealership.
 
Dealing with the Centres is a bit of a nightmare ATM. I’ve just managed to book a service for my Cayman in late September but still can’t get a courtesy car!
 
Jeff

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Carlton
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Re: Huge oil smoke from exhaust 2021/08/09 21:44:18 (permalink)
I have got the car back from the local dealer, they have replaced the non return valve and the oil pipes to the turbos.  They asked me to review the situation for the next 600 miles if any smoke appears on start up they will then replace the turbos. Apparently as Yorkiepud86 mentioned its a known problem with GTS versions, although mine is the 1st none GTS model they have needed to repair!  They inspected the turbos and catalytic converter and all appeared to be OK. So hoping that's the end of the problem!
 

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