discussion BMW E90 Severe Oil Loss

[Pap3r]

Evening,

I hope you're all doing well.

I got an 2007 BMW E90 320i that I have been driving as a hand me down from my parents. Been having the car maintained and serviced at BMW as that was where my parents always had it serviced since 2007. Had the timing chain replaced in July '26 at BMW, as I liked the 2 year warranty despite the expense. Oil sump was removed and cleaned according to BMW too. However when I started the car on Friday and when I drove 800m away from my place. Red oil lamp came on, bad car shudder, but I managed to pull into the Engen petrol station a few meters away from the time of the shudder. Opened the bonnet, and saw all the oil on the bottom of the engine bay. Had the car towed to BMW. They came back yesterday saying the cause of the oil loss was that 2 bolts were loose on the OFH, which caused the gasket to pop out, and jetison ALL the oil within a couple seconds. There's a video of it but it is too big to upload. I can see it sticking out between the two surfaces.

I suspected workmanship, negligence and oversight due to my engineering background. I saw the receipts from 2024, that the OFH gasket and PCV valves were replaced. So that made me wonder why bolts failed so suddenly. Went to BMW, DP wasn't there, so spoke to Service Manager.

He said with the foreman. Due to the age and high milage of the vehicle at 240,000km. The mating surface and threads of the OFH are no longer guaranteed to be in spec, so therefore they cannot pay for damages caused by failed bolts. The vehicle is test driven, at various temperatures, and loads and it passed at the time of hand over for the timing chain work. Any negligence would have been seen immediately. The car engine is aluminum, and the bolts for the OFH are steel, and steel over time will wear down the threads, causing them with the heat of the engine, to be stripped and loose. Heat expands the metal, and therefore, cause enough play to pop the bolts out. They can offer 10% discount for the parts as a resolution. I am at a loss and not sure what to do.

I argued that the bolts were definelty overtorqued, and failed due to the constant pressure from the OFH. They said everything in spec as a counter with age and that it lasted 2 years. I then said, if you hang a picture with a skew screw, it will hold, but it will eventually fall off due to incorrect installation procedure. They said if the material of the wall was old, it will also cause a correct installation to cause the picture to fall off. I asked why didn't they report of wear on the threads, and they said it was in spec at the time of installation.

I am concerned that the rods or bearing are absolutely shacked, or the guides on the timing chain broken etc. Did a scan on the car before handover at BMW, and saw it had misfires on all 4 cylinders, and VANOS issues. Prob due to the oil loss.

BMW wants essentially 10k for new threads, new gasket and oil change to test the car which is now a possible lemon due to poor workmanship at BMW, which you expect a car looked after by them to be in good mechanical condition.

Car has never overheated and been serviced on time, and oil changes every year at BMW, at the same dealer.

I think I will start taking the bus, until I can find a nice diesel or that V6 Toyota Camry. It feels so shit lol.

 

[Solo Man]

Just to clarify. In the second paragraph you say "Had the timing chain replaced in July '26 at BMW" but further on you say the receipts were for work done in 2024. I assume that is a typo and that the work was done in 2024 and not 2026??
It sounds like bull dust to me anyway as it is the first time that i have heard of oil filter housing bolts suddenly giving way like that. In my opinion it should start as a very slow oil leak but not a sudden loss of oil as you described. Were there never oil on the floor/ground in the last few weeks before the incident? If i were you i would definitely investigate this further.

 

[Pap3r]

Just to clarify. In the second paragraph you say "Had the timing chain replaced in July '26 at BMW" but further on you say the receipts were for work done in 2024. I assume that is a typo and that the work was done in 2024 and not 2026??
It sounds like bull dust to me anyway as it is the first time that i have heard of oil filter housing bolts suddenly giving way like that. In my opinion it should start as a very slow oil leak but not a sudden loss of oil as you described. Were there never oil on the floor/ground in the last few weeks before the incident? If i were you i would definitely investigate this further.

No typo. Timing chain was paid and completed in July 2026. Oil sump was removed and cleaned according to BMW. Oil Filter housing gasket and PCV valve and related tubing replaced in September of 2024 as preventative maintenance. I will try find a way to upload the video on a lighter compression tomorrow. There was never oil on the floor in the garage or in the bottom of the engine bay, the last few weeks. This really felt like a sudden expulsion of the gasket out of the housing that lead to sudden oil loss.

 

[Pap3r]

 

[TurboLlew]

Firstly don't throw R50K at a R50K car unless it is very special. A 320i is not.

Secondly, are you sure it is actually that gasket and those loose bolts: A sudden failure is more likely to be caused by the work recently done. Not the thing that has held up for over 2 years whether installed correctly or not. Again, these don't tend to fail the way you've described. There are also two bolts and two sets of threads that have the exact same mode of failure simultaneously? I would think it is more likely that there WAS some sort of a leak here but the actual root cause of your massive oil loss was something done as part of the timing belt service.

I'd involve BMW SA/customer service in comms on this. However, I think it will be an uphill battle getting them to warranty anything

 

[Pap3r]

I received this from BMW this morning, the job cards for 2026 and 2024. Which I attached.

Firstly don't throw R50K at a R50K car unless it is very special. A 320i is not.

Secondly, are you sure it is actually that gasket and those loose bolts: A sudden failure is more likely to be caused by the work recently done. Not the thing that has held up for over 2 years whether installed correctly or not. Again, these don't tend to fail the way you've described. There are also two bolts and two sets of threads that have the exact same mode of failure simultaneously? I would think it is more likely that there WAS some sort of a leak here but the actual root cause of your massive oil loss was something done as part of the timing belt service.

I'd involve BMW SA/customer service in comms on this. However, I think it will be an uphill battle getting them to warranty anything

Thanks, yeah it makes sense. I felt though, complete service history, so I had trust in the vehicle than paying for an partial history or unknown car of any brand. I really want to get this sorted, as I am getting quite busy due to close of end of year.

 

[Spanky]

That really sucks man. Sorry to hear that happened.

Unfortunately that engine almost certainly has significant damage. Any amount of driving with zero oil pressure is going to nuke the bearings, journals, cam lobes etc etc..

A cheap low mileage replacement engine might be on the cards, but as others have said, the car's value doesn't really justify significant investment.

 

[TBP88]

Engine is almost 100% totalled. The cost of repair will be at least the value of the car, maybe more. Realistically you can fight it, and you should, but don't plan or expect on any positive resolution to this (and indeed, if you involve MIOSA it'll be years before a resolution hits, and likely months after that before you get compensated).

This is, sadly, just a shitty situation where they'll get away with it (effectively) Scott free.

As Llew said, do not spend R50k fixing the car, even if it has HUGE personal value to you, any money you throw at it now is money on fire.

 

[evnmopwr]

If i read and understand this correctly, IM calling BS

it is not mechanically possible for correctly torqued, healthy bolts and threads on a BMW Oil Filter Housing (OFH) to suddenly fail or back out two years later without a prior installation error or severe external mechanical interference.

The dealership’s explanation defies fundamental mechanical engineering principles.

Based on my personal experiance, Threads on aluminum block fail 1 of 2 ways:

1. Over Torquing - Prior to me using Torque Wrenches, Thread Butler in Cape town Regularly came to pay me a visit to install new Threads.
2. Cross threading - If a bolt is inserted at an angle and forced in, it cuts new, weak threads into the aluminum. It will hold temporarily but will eventually fail under pressure.

Eitherway, Its a problem they caused

I dont think the OFH needs to be removed on N46 engine to do timingchain But usually stuff is loosend/removed to give more space to do the job.
The 2026 timing Chain replacement is the smoking gun and the fact that 2 Bolts/Threads Failed at exactly the same time after that, Is telling me it was workmanship error.

I pasted your Post into AI now and Drafted a Nice letter Calling the Dealers BS. Have a read, I would send this to BMW-SA and include the DP of the dealer you sent to and take this further.

I would want a new Engine.

 

[evnmopwr]

Engine is almost 100% totalled.

And this would be why they dont want to take the blame

 

[TBP88]

And this would be why they dont want to take the blame

100% And I agree, OP *SHOULD* fight this. I just want OP to be realistic. That car is not gonna be fixed for a long, long time. They will not own up, they will not help you. So just be ready for that emotionally.

 

[Pap3r]

Thanks everyone for the advice but the main downside at the moment, is that I am really stressed with time atm. There's lot of important meetings lined up, and it is poorly timed with the car. My parents said that they can gather and pay the 10k, try sell the car afterwards, and that I won't have a car until at most next year.

 

[TurboLlew]

Thanks everyone for the advice but the main downside at the moment, is that I am really stressed with time atm. There's lot of important meetings lined up, and it is poorly timed with the car. My parents said that they can gather and pay the 10k, try sell the car afterwards, and that I won't have a car until at most next year.

IMHO There is no way the R10K is going to come close to fixing the car or getting it to the point where you can trade/sell it. It is the start of throwing good money after bad. Also 10K sounds exorbitant for that work.