Please reduce oil level?
02-28-2019, 02:56 PM
#41
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Hi. "New-ish" S5 B9 Coupe owner. Car less than 1 year old and ran into this exact issue during the cold weather snap here in Oregon. Took it into the dealer and they did reduce the oil level slightly, also updated the SW because I referred to the aforementioned TSB. Completed this Monday, weather conditions have been the same (still cold) and no further warning light. Hopefully that helps folks.
02-28-2019, 04:22 PM
#42
https://www.caranddriver.com/news/a2...sue-2017-2018/
02-28-2019, 04:37 PM
#43
AudiWorld Super User
So get an oilanasis.
Yes. Sounds like oil dilution. Honda having problems with it in the turbocharged 1.5 in the CRV.
https://www.caranddriver.com/news/a2...sue-2017-2018/
if nobody else else has suggested it.
02-28-2019, 07:56 PM
#44
YES. Good idea to do that. Wait till nearer the end of the service interval and get a sample.
Short description of what causes this. Direct injection engines spray atomized fuel directly into the combustion chamber. If the engine is really cold, some of that liquid fuel condenses on the cylinder walls and gets forced past the rings into the crankcase. If some fuel goes there rather than being burned, the O2 sensors see a lean condition and add even more fuel to the cylinder to compensate. This happens more when idling and when it is cold. Under normal conditions and longer drives this fuel evaporates out of the oil and gets burned through the crankcase ventilation system. If it’s really cold with lots of idling and or short drives, there is not sufficient time or temperature for this to happen. The fuel builds up in the oil and the oil level rises. I would suggest shorter oil change intervals under cold conditions.
Short description of what causes this. Direct injection engines spray atomized fuel directly into the combustion chamber. If the engine is really cold, some of that liquid fuel condenses on the cylinder walls and gets forced past the rings into the crankcase. If some fuel goes there rather than being burned, the O2 sensors see a lean condition and add even more fuel to the cylinder to compensate. This happens more when idling and when it is cold. Under normal conditions and longer drives this fuel evaporates out of the oil and gets burned through the crankcase ventilation system. If it’s really cold with lots of idling and or short drives, there is not sufficient time or temperature for this to happen. The fuel builds up in the oil and the oil level rises. I would suggest shorter oil change intervals under cold conditions.
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JBall7467 (01-17-2020)
03-01-2019, 04:11 AM
#45
AudiWorld Super User
Always good to avoid long idles and take the car out for a long drive, to prevent conditions such as the one mentioned above or any other kind of sludge build up.
03-01-2019, 04:19 AM
#46
AudiWorld Senior Member
Short description of what causes this. Direct injection engines spray atomized fuel directly into the combustion chamber. If the engine is really cold, some of that liquid fuel condenses on the cylinder walls and gets forced past the rings into the crankcase. If some fuel goes there rather than being burned, the O2 sensors see a lean condition and add even more fuel to the cylinder to compensate. This happens more when idling and when it is cold. Under normal conditions and longer drives this fuel evaporates out of the oil and gets burned through the crankcase ventilation system. If it’s really cold with lots of idling and or short drives, there is not sufficient time or temperature for this to happen. The fuel builds up in the oil and the oil level rises. I would suggest shorter oil change intervals under cold conditions.
03-01-2019, 11:06 AM
#47
AudiWorld Senior Member
Great. I read this 5:15am as I had just turned on my car to warm up in the driveway in frozen Oregon. I quickly jumped into the car and took it for a drive (long enough to warm up) before hitting the pool. :-)
03-01-2019, 12:59 PM
#48
AudiWorld Super User
lol, in the winter, i warm my car up for about 1 minute and in the summer, 30 seconds, just enough time for the oil to get circulated to the top of the engine. If you have a forzen car, there is no way around a long idle but it is not the best thing to do to an engine.
03-03-2019, 06:52 AM
#50
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Me too
Chiming in: My B9 S5SB also had this issue on a particularly cold week. I do fairly short trips (10 km one way with a stop at daycare to pick up the rugrat). Dealership found 18 mm of oil where there should be 16 mm. Said the oil didn't smell of fuel. Just had the oil changed at one year, so hopefully it won't come come back.