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      08-01-2014, 10:08 AM   #1
houtan
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rust in rear subframe

Recently finished some suspension mods and while working on the rear on the passenger side I noticed some rust on the rear subframe. This is my first BMW si I'm not sure if this is common and if I need to do something about it. Have you heard or seen this on your 1ers? Any input is appreciated. I did a Google search and didn't find much info.
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      08-02-2014, 08:36 AM   #2
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Not so sure. Ill have to put my car on the lift and check it out. Do you drive in salt often?

If i were you I would get something to grind it down and spray the area with some protective coating to prevent the rust from getting worse.
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      08-02-2014, 08:51 AM   #3
houtan
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I do not drive in salt but the previous owner lived in Michigan for about a year. I'm still under warranty so I am going to have the dealership check it out and see what happens. I am curious if this is a common issue. I agree, would be a good idea to clean up the rust and paint it.
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      08-02-2014, 02:12 PM   #4
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my 08 has some rust, but to me it appears more surface than anything. Some parts may look like yours
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      08-02-2014, 03:57 PM   #5
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Quote:
Originally Posted by houtan View Post
I do not drive in salt but the previous owner lived in Michigan for about a year. I'm still under warranty so I am going to have the dealership check it out and see what happens. I am curious if this is a common issue. I agree, would be a good idea to clean up the rust and paint it.
Well, they still salt roads in Michigan I think. Dealership aint going to do nothing about it under warranty. In socal you wont have anywhere near the problem.
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      08-02-2014, 04:24 PM   #6
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Well, they still salt roads in Michigan I think. Dealership aint going to do nothing about it under warranty. In socal you wont have anywhere near the problem.
Last time I checked... the ocean still has salt in it.
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      08-02-2014, 05:14 PM   #7
houtan
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Hahaha. Well thanks for the replies. I will ask the dealership to check it out the next time I am in for service. Will let everyone know what they say.
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      08-02-2014, 11:22 PM   #8
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Last time I checked... the ocean still has salt in it.
Ocean air is one thing, salting roads that are frozen over is another. In that case you are literally driving in salt water. Cars from the east coast always, especially the north east, suffer from rust far more then those on the west coast.

ask me how I know
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      08-03-2014, 12:00 AM   #9
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Michigan is known for salty roads. I-75 just south of Detroit gets really nasty.


Most of the road looks about like that, with the occasional deep pothole that will destroy your wheels & tires.
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      08-03-2014, 05:52 AM   #10
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Quote:
Originally Posted by MarkkyyMan View Post
Michigan is known for salty roads. I-75 just south of Detroit gets really nasty.

Most of the road looks about like that, with the occasional deep pothole that will destroy your wheels & tires.
+1

Not sure they use that much less salt in Ohio and Indiana! Was shocking to move here and see that enormous amount of salt used on the roads in the winter. No way I plan to keep any car forever that has been driven in the winter as a daily driver in this part of the country!
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      08-05-2014, 12:09 PM   #11
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Quote:
Originally Posted by MarkkyyMan View Post
Michigan is known for salty roads. I-75 just south of Detroit gets really nasty.


Most of the road looks about like that, with the occasional deep pothole that will destroy your wheels & tires.


OMG!!!!
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      08-05-2014, 04:41 PM   #12
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no big issue

1 year thru a salty winter will do it. Take a 1 inch wide paint brush, dip it in oil and "paint" over the rust being careful not to get any oil on any rubber. Been doing this for years (actually with every oil change)
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      08-05-2014, 08:35 PM   #13
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Daym. That road is horrible.

What kind of oil? Motor oil?
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      08-05-2014, 08:42 PM   #14
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I feel like I am screwed. I drove my car through 2 winters so far here in PA. Will a shop do any sort of work like this?
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      08-05-2014, 08:52 PM   #15
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i pulled my subframe and had no rust like this.

If anyone is interested in a subframe from california ( no snow) i have my old one. Its perfectly fine - not removed due to accident. Only removed because I went full m3.
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      08-07-2014, 07:02 PM   #16
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Just saw my subframe, quite bit of rust liek yours :S
Winter and salt are the culptits
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      08-07-2014, 08:42 PM   #17
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Rustolium makes a product called "Rust Reformer" in a rattle can. Been using it on all my cars when I see some surface rust. Works great.

http://www.rustoleum.com/en/DigitalE...-rust-reformer
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      08-08-2014, 07:20 AM   #18
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If you are really worried about it, drop it, strip it, POR15 it, and then coat it with Wurth underbody coating.
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      08-16-2014, 12:56 PM   #19
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Lots of good suggestions here, the last obviously the most comprehensive. You do want to do something and sooner rather than later. Rust is a disease you don't want to let get started. Can't stand the thought of it myself on a car that's a keeper. Garaged Dec- April . Drive a $3000. Honda in the slop.
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      08-16-2014, 05:42 PM   #20
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I put fluid film on mine to protect.

http://www.amazon.com/Fluid-Film-Cor.../dp/B007US3YGM
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      08-18-2014, 10:24 AM   #21
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I agree there are really good suggestions. I am going to notify my dealership when I go in for my next service and see what they say. If they do not do anything about it I will try one of the options in this thread. will definitely post back what happens with the dealership.
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      08-18-2014, 01:30 PM   #22
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Lots of good suggestions here and they all will work. You asked about mine, yes, just ordinary motor oil (a very thin film)
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