02-28-2024, 04:26 AM | #1 |
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F30 330d N57 Insanely high oil consumption
So I've had a 330d for about a month now. I got it serviced the first few days I had it at a BM Specialist. Since then it has consumed 5 whole litres of oil in just 2000 miles!!!!!
I always verify with the dipstick before topping up so it's not a sensor issue. The BM specialist had a look for free and couldn't find the issue. They said they checked the boost pipes and intercooler, checked the turbo for play and found no evidence of burning oil from the turbo back. There is absolutely zero leaks as well. They basically said keep driving it, until it gets worse but I'm not really happy with that tbh. The oil has to be going somewhere?? Has anyone got any idea what might be happening here?? Thanks. Funny thing is this is supposed to be the most reliable engine and somehow I've bought a stinker hahaha Edit: I've also had it scanned with ISTA and a code keeps coming back for the pre cat 02 sensor - 287100 - 287500 Also, bimmerlink will not show oil temp for some reason, although the oil temp gauge on the cluster seems to be working |
02-28-2024, 05:21 AM | #2 |
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It's either blowing past the turbine wheel into the DPF/Cat, or the engine is burning it.
Given what you've said/had checked, it can't be anything else. The O2 sensor is probably oil fouled. Much blue/white smoke out the back? Cats and DPFs can absorb a lot of it, so modern oil burners don't tend to be fog machines anymore. Next steps would be to check the turbo and compression/leak down test the engine. As in take off the DPF and check the turbine housing for evidence of oil. They are reliable. A few bad eggs doesn't mean the entire batch is bad. You haven't mentioned it's mileage or it's history. There are a few oil temp channels to choose from in Bimmerlink. Did you pick the right one? |
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02-28-2024, 06:29 AM | #3 | |
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Its got 100k miles and it has BMW service history but he only got it serviced every 20k miles which is obviously way too long between services. I've tried all the oil temp things I could see in BimmerLink, whats the right one called? Thanks for the reply |
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02-28-2024, 06:41 AM | #4 |
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The PCV valve might have failed, costs about £20 to replace but you'll have to buy an aftermarket part. You can't really check it as the tabs on the cap will break. The replacement comes with a new cap.
For the turbo, take off the pipe between the turbo and intercooler and check if excessive oil is present. Could be leaking past the bearings. Could also check for excessive play in the compressor shaft. I have a 335d and use 1 litre of oil every 4400 miles.
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02-28-2024, 07:12 AM | #6 |
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02-28-2024, 07:15 AM | #7 | |
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BM specialist said there was no play in the turbo |
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02-28-2024, 07:55 AM | #8 |
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Yes, BMW would replace the whole rocker cover, but you can buy the PCV valve separately.
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02-28-2024, 08:31 AM | #9 |
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02-28-2024, 08:56 AM | #10 |
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Not at all. I think I removed the intake pipe to get to the PCV valve but that's about it.
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02-28-2024, 10:07 AM | #11 | |
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Good shout on the PCV, although your guys would have flagged that as the compressor housing, boost pipes and intercooler would all be absolutely full of oil. 5 litres over 2000 miles is insane. Really bizarre there is no evidence by way of oil pooling in the boost path, leaks or smoke!! |
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02-28-2024, 10:31 AM | #12 | |
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My 30d used zero oil until the turbo started leaking oil (~95K miles), coincidentally from the hot and cold side simultaneously, and then it suddenly started consuming at a rate of around 1L / 500 miles. Zero smoke. The seals had developed too much tolerance (technically they are oil flingers, not an oil-tight seal), allowing oil to bypass them. New OEM turbo, zero oil consumption once again.
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02-28-2024, 11:14 AM | #13 | |
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02-29-2024, 02:03 AM | #14 | |
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My turbo was leaking to the extent that oil was steadily dripping on to the workshop floor even though there was no play/float in the turbo shaft bearing.
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02-29-2024, 10:11 AM | #16 |
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02-29-2024, 12:37 PM | #19 |
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Cylinder 5, showed wear no further details. I had a leaking EGR cooler and coked manifold prior so maybe this was the cause.
Hasn't used any oil since and over 190k now |
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02-29-2024, 12:40 PM | #20 |
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£250, excess on insured warranty!!
they first did the rocker cover gasket. I knew this wasn't causing the oil use so persisted and stuck to the line that their first attempt to deal with the oil use hasn't worked. Took a while, total warranty cost of almost 14k. |
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02-29-2024, 12:59 PM | #21 |
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In my experience and as others have said 30d/35d engines really shouldn’t need topping up between oil changes (which will be every 18-20k miles if you do high mileage i.e. lots of motorway plugging). Some owners do go for interim changes but I really don’t see the point when BMW and oil makers have spent years developing the long life oils our engines use. I ran these engines from 2003-2018 ranging from 70k-115k miles on each and didn’t need to add a drop. Obviously they will start to use a nominal amount as they age beyond these sorts of mileages but it shouldn’t be much at all. It really does sound like turbo seals to me and pretty easy to check for the losses you are experiencing.
BMW petrol engines do drink some oil but even my M3 (now on 50k) only needs a 1ltr top up at 9k miles between oil changes at 18k… Hope you get it sorted…
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02-29-2024, 02:51 PM | #22 | |
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Most ENGINEERS say every 3-4k you should be changing oil. If you're getting rid after 3 years you'll probably see no difference - someone else will get your worn car. I'm not - I'm going with the engineers advice Some Top Engine Designers say 2k miles! |
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