[banem2]

So after 3 tries I finally got my dealership to agree to check my fuel injectors and the injector at cylinder 1 was indeed bad. I was having rough starts and black smoke coming from the tailpipe for months, but the car wasn’t throwing any codes so BMW wouldn’t approve any repairs.

The mechanic mentioned during the two previous visits that my oil levels were high. I said I haven’t touched them. I now know it’s because the injectors were leaking fuel into the cylinder and down into the engine oil. This was most likely happening for roughly 3k miles since BMW wouldn’t work on the car without any codes.

I’m just wondering if I should be throwing a fit here or if this isn’t a big deal? They are definitely trying to minimize it. Thoughts?

[BroDoze]

Well good on you for pushing them and not backing down. Does the car drive any different? Were you getting stuttering or anything while driving?

[Tag]

Fuel dilution of oil is bad. Depending on how much fuel was in the oil it could lead to premature wear of components that are lubricated by engine oil.

Recommend you talk to a manager and work with them to do the following.

• Get an oil sample and have it sent to an independent lab for testing.
• Inspect oil filter for any metal wear.
• Request a compression test on all cylinders.

[banem2]

Originally Posted by Tag

Fuel dilution of oil is bad. Depending on how much fuel was in the oil it could lead to premature wear of components that are lubricated by engine oil.

Recommend you talk to a manager and work with them to do the following.


Get an oil sample and have it sent to an independent lab for testing.
Inspect oil filter for any metal wear.
Request a compression test on all cylinders.

You think 3k miles was enough to cause these kind of issues. They told me the cylinders look “brand new”

Thanks for the advice!

[banem2]

Originally Posted by BroDoze

Well good on you for pushing them and not backing down. Does the car drive any different? Were you getting stuttering or anything while driving?

Yeah I was definitely annoyed by how long of a process this was. BMW actually wrote a note stating that stumbling starts are normal in the s58 and not something to be concerned with. 🙄

I’m not sure if the car drives any differently because this has been happening since the car was pretty much new. I only know the car one way.

[Tag]

Originally Posted by banem2

You think 3k miles was enough to cause these kind of issues. They told me the cylinders look “brand new”

Thanks for the advice!

Only way to know for sure is to do the tests. 'Looking brand new' means nothing.

[banem2]

Originally Posted by Tag

Only way to know for sure is to do the tests. 'Looking brand new' means nothing.

No metal in the oil filter, but BMW won’t approve a compression test on the vehicle. 😑

[Tag]

Originally Posted by banem2

No metal in the oil filter, but BMW won’t approve a compression test on the vehicle. ��

Did they show you the filter or are you just taking their word? If they haven't drained the oil yet get yourself a sample and send it in for analysis yourself.

Take it up with the manager and if they're not helpful escalate it with BWM NA.

[DutchBoysRacing]

Originally Posted by Tag

Only way to know for sure is to do the tests. 'Looking brand new' means nothing.

100% this. Even if the test come back "good", this is still indeed "not good. How much extra wear was done or will this become an issue down the road when you don't have a warranty?

[///M TOWN]

Originally Posted by DutchBoysRacing

100% this. Even if the test come back "good", this is still indeed "not good. How much extra wear was done or will this become an issue down the road when you don't have a warranty?

You’re not wrong

Just reading this thread is enough to make me concerned for the OP

[yash27]

How long did it take for this to start happening? Was it after a service?

[Dave07997S]

Originally Posted by banem2

So after 3 tries I finally got my dealership to agree to check my fuel injectors and the injector at cylinder 1 was indeed bad. I was having rough starts and black smoke coming from the tailpipe for months, but the car wasn’t throwing any codes so BMW wouldn’t approve any repairs.

The mechanic mentioned during the two previous visits that my oil levels were high. I said I haven’t touched them. I now know it’s because the injectors were leaking fuel into the cylinder and down into the engine oil. This was most likely happening for roughly 3k miles since BMW wouldn’t work on the car without any codes.

I’m just wondering if I should be throwing a fit here or if this isn’t a big deal? They are definitely trying to minimize it. Thoughts?

They better check for cylinder scoring as well. The fuel strips the oil off the cylinder walls

[banem2]

Originally Posted by ///M TOWN

You’re not wrong

Just reading this thread is enough to make me concerned for the OP

Yeah and this is happening to a fair amount of people. I know of multiple owners who have had stumbling start/long crabm issues that their dealerships “can’t figure out.” Seems fairly common in M3/M4 as well.

[banem2]

Originally Posted by Dave07997S

They better check for cylinder scoring as well. The fuel strips the oil off the cylinder walls

They scoped the cylinder. Said it looked brand new, so that’s a plus.

[banem2]

Originally Posted by yash27

How long did it take for this to start happening? Was it after a service?

It started happening a couple months after owning the car. So like 500-1000 miles in.