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      09-16-2018, 07:02 PM   #1
eRocks
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Rear side bumper vertical "crease"?

When the car got dirty for the first time, I noticed that in certain lighting there is a noticeable line or crease due to ever so slight change in geometry on the rear lower side bumper. The line is on both sides in the same place. Does everyone have this and is it as noticeable as mine? Here's a pic:
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      09-16-2018, 07:44 PM   #2
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just went to look on mine (an F80). no vertical crease. that would be a weird place for a character line anyway since there already are two horizontal creases. can you feel the crease?
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      09-16-2018, 09:32 PM   #3
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Quote:
Originally Posted by eRocks View Post
When the car got dirty for the first time, I noticed that in certain lighting there is a noticeable line or crease due to ever so slight change in geometry on the rear lower side bumper. The line is on both sides in the same place. Does everyone have this and is it as noticeable as mine? Here's a pic:
That's definitely not there on with of our M3s
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      09-16-2018, 09:46 PM   #4
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Quote:
Originally Posted by mln View Post
just went to look on mine (an F80). no vertical crease. that would be a weird place for a character line anyway since there already are two horizontal creases. can you feel the crease?
I can’t feel it, but it’s definitely caused by the physical shape of the bumper cover. If I vary the light angle from the rear of the car, the shadow cast changes a bit. I’ll post some more pics Of the different lighting. The weird thing is that it’s on both sides in the same spot, with the same amount of slight angle relief. Also, it clearly starts where the the top of top horizontal line ends, or rather blends into side. But it’s strange, seems like a QC issue maybe, which really sucks if true because I doubt bmw na will replace this under warranty.
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      09-16-2018, 11:31 PM   #5
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when was the build date of your car?
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      09-17-2018, 12:46 AM   #6
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No vertical crease here. Sounds like a unique issue.

It doesn't look too bad in the pics so all is well.
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      09-17-2018, 06:19 AM   #7
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One of my friend's and my M3 both have that. Our cars were built in May June 2018. I had a 2016 model and it wasn't as obvious on that car. I know that today because my friend bought my old car. The reason for that line is they must have had a mold repair that makes the bumper and now there is a witness line there

Last edited by 09carreras; 09-17-2018 at 07:20 AM..
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      09-17-2018, 07:00 AM   #8
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Quote:
Originally Posted by 09carreras View Post
One of my my friend's and my M3 both have that. Our cars were built in May June 2018. I had a 2016 model and it wasn't as obvious on that car. I know that today because my friend bought my old car. The reason for that line is they must have had a mold repair that makes the bumper and now there is a witness line there
That makes a lot of sense. I was going to ask op if he thought that might be PPF, but he said he can't feel it with his finger.
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      09-17-2018, 08:35 AM   #9
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Mine has this. I never noticed it on my 2016. But on my 2018 the other day I thought there was a crease walking out to my car - I double checked and it is identical on both sides. It also exists on both the LRG and SMB CS' I've seen.

It is hardly visible unless you catch it from the right angle and the right lighting.

Here are two pics of the LRG.
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Last edited by cwhands; 09-17-2018 at 08:59 AM..
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      09-17-2018, 08:35 AM   #10
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Quote:
Originally Posted by Poiseuille View Post
Quote:
Originally Posted by 09carreras View Post
One of my my friend's and my M3 both have that. Our cars were built in May June 2018. I had a 2016 model and it wasn't as obvious on that car. I know that today because my friend bought my old car. The reason for that line is they must have had a mold repair that makes the bumper and now there is a witness line there
That makes a lot of sense. I was going to ask op if he thought that might be PPF, but he said he can't feel it with his finger.
Could it be plastic wrap from factory while in transit? Once removed maybe it is less susceptible to grabbing dust? Though I would think the opposite would be true.

Don't see anything on mine. Feb 2018 production.
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      09-17-2018, 09:14 AM   #11
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Quote:
Originally Posted by eRocks View Post
When the car got dirty for the first time, I noticed that in certain lighting there is a noticeable line or crease due to ever so slight change in geometry on the rear lower side bumper. The line is on both sides in the same place. Does everyone have this and is it as noticeable as mine? Here's a pic:
June 20, 2018 build, and have these creases on both sides of my M3. You really have to be looking for them to see them. I didn't notice it until you pointed it out. I never noticed these on my 2015 M4.
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      09-17-2018, 09:37 AM   #12
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i see things like this all the time. 99% of time the MW messing with my mind
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      09-17-2018, 09:44 AM   #13
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Quote:
Originally Posted by rblood303 View Post
when was the build date of your car?
Build date is 6/28/18. Reading through some of the other replies, seems to only be an issue with 2018 cars so far.
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      09-17-2018, 10:51 AM   #14
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Quote:
Originally Posted by 09carreras View Post
One of my friend's and my M3 both have that. Our cars were built in May June 2018. I had a 2016 model and it wasn't as obvious on that car. I know that today because my friend bought my old car. The reason for that line is they must have had a mold repair that makes the bumper and now there is a witness line there

This would explain it for sure and seems to be what has probably happened. Especially since older car owners report that they don't see it. maybe a new mold or repaired mold was used starting for 2018 since it seems like all those reporting it have '18 cars.
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      09-17-2018, 10:52 AM   #15
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Quote:
Originally Posted by cwhands View Post
Mine has this. I never noticed it on my 2016. But on my 2018 the other day I thought there was a crease walking out to my car - I double checked and it is identical on both sides. It also exists on both the LRG and SMB CS' I've seen.

It is hardly visible unless you catch it from the right angle and the right lighting.

Here are two pics of the LRG.
Thanks for the pics, I guess those of us with 2018 cars get an extra 'signature' line.
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      09-17-2018, 11:13 AM   #16
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Smile No Crease, but Maybe a Missing Clip

I have no crease in my F80 rear quarter, but the left side panel in the same place has an internal clip missing (I presume), the panel moves back and forth quite a bit when its pushed on in comparison to the opposite side that does not move. I haven't been bothered enough by it to pull apart and look or say anything to the dealer. Maybe next time, I will ask to see if there is anything to be done.
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      09-17-2018, 11:21 AM   #17
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Quote:
Originally Posted by DBACE View Post
I have no crease in my F80 rear quarter, but the left side panel in the same place has an internal clip missing (I presume), the panel moves back and forth quite a bit when its pushed on in comparison to the opposite side that does not move. I haven't been bothered enough by it to pull apart and look or say anything to the dealer. Maybe next time, I will ask to see if there is anything to be done.
That's funny, the left side on mine does the exact same thing. A lot of back and forth play that doesn't exist on the right side. Right side is tight as a drum.
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      09-17-2018, 01:04 PM   #18
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Has to be a defective mold coming out of the plant.
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      09-17-2018, 01:17 PM   #19
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Has to be a defective mold coming out of the plant.
Was thinking similar. Perhaps not enough urethane/plastic in that area of the mold?
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      09-17-2018, 03:30 PM   #20
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July 2018 production. F80.

I have the vertical crease too but they seem far less obvious than in your pics. Wouldn't have noticed had you not posted, now I can't unsee it.

Only saw it with a flashlight... very subtle, but it's there...
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      09-17-2018, 05:05 PM   #21
eRocks
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Quote:
Originally Posted by MomoM3 View Post
July 2018 production. F80.

I have the vertical crease too but they seem far less obvious than in your pics. Wouldn't have noticed had you not posted, now I can't unsee it.

Only saw it with a flashlight... very subtle, but it's there...
Noooo, sorry to you and everyone I have infected with my OCD in this thread. In my pic, I'm using a fairly bright LED flashlight close up to the rear bumper. Outside in the sun, I can't see it unless I really try.

I was more worried that the dealer had tried to cover up damage or something. Now that I know it's coming out of the factory, it actually doesn't bother me.
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      09-17-2018, 06:30 PM   #22
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Yeah I have them and I noticed it when I picked up the car it’s not really noticeable unless your at an angel to see it.
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