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Mazda Rear Subframe Rot - Pics #5420175 05/03/20 06:19 PM
Joined: Dec 2007
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GMFan Offline OP
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Hey all,

Attached are some pictures of the rear sub frame on my '11 Mazda6.

The front sub frame was replaced by the dealer about 6 months ago as it was rotted out - this was covered under a recall so all work was done for free. Apparently the coating applied at the factory wasn't sufficient for corrosion protection. However, I also have rust on the rear sub frame - for which there is currently no recall on this. To me it looks like there was a similar fault in the factory for the rear sub frame as well. Question is how bad does it look? Car has 140k miles and runs great.

Is this something I need to get addressed now or can I let it be and get a few more years out of the car? The main thing that concerns me is the cracking. Thanks.

Pics


2011 Mazda6, 2.5L/6MT - 140,000 miles
Castrol Edge 0W-20
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420182 05/03/20 06:33 PM
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Jackson_Slugger Offline
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I'd look into getting a rust prevention oil sprayed or having it sprayed at a shop if available there. A local company makes an oil spray for cars: https://shopcarwell.com/main.sc


Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420192 05/03/20 06:50 PM
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buddylpal Offline
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No rust prevention products will protect that. By the looks of it you’ll get one more winter out of that rear subframe. I wouldn’t be surprised if it falls apart after hitting a jaw shattering bad hole in the road to be honest. What’s crazy to me is the rest of the suspension doesn’t look that badly rusted! Must have been improperly painted/protected from the factory like you said.


A couple GM's and a Hyundai.
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420200 05/03/20 06:57 PM
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incognito_2u Offline
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Kiss of Death......welcome to my world of the NY Rust belt....
Is that a Southern vehicle?


2006 Jeep Commander 3.7 V6 -116k (M1EP5W30/XG3600)
2006 Toyota Corolla 1.8 VVTi -88k (M1EP5W30/XG3600)
1999 Toyota Corolla 1.8 -92k (PUP5W30/XG4386)
1998 Toyota Corolla 1.8 -68k (VME5W30/XG3600)
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420205 05/03/20 07:03 PM
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Number_35 Offline
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Sad to see this; I'd heard that the Mazda rust problems ended c. 2009. In 2013 when I was last shopping for a vehicle, a Mazda salesman told me the last rusty year was '04 or '05, but since then I've seen later Mazdas, at least up to MY '09, with the rusty rear wheel wells.

Hopefully that subframe is an anomaly.

Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420206 05/03/20 07:03 PM
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ZeeOSix Offline
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I hate salted roads.

Re: Mazda Rear Subframe Rot - Pics [Re: incognito_2u] #5420207 05/03/20 07:08 PM
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GMFan Offline OP
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I bought brand new in March 2011. I lived in upstate NY where winters are brutal. I moved down to NC in 2015. I think a combo of faulty finished sub frame and 4 years set the cancer in. My Dad has a 2003 Chevy Trailblazer that has less rust that this car. I owned GM cars up in NY which never rusted out like this.


2011 Mazda6, 2.5L/6MT - 140,000 miles
Castrol Edge 0W-20
Re: Mazda Rear Subframe Rot - Pics [Re: Number_35] #5420214 05/03/20 07:14 PM
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Car was assembled in Flat Rock, MI in Ford factory. This car is basically a Ford Fusion. I figured the rust wouldn’t be an issue since it was built in a Ford factory instead of Mazda factory. Bad luck of the draw with faulty sub frames. Based on what you all see am I okay for a while or does it need replacement. Thanks.


2011 Mazda6, 2.5L/6MT - 140,000 miles
Castrol Edge 0W-20
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420216 05/03/20 07:15 PM
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MParr Offline
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Did you buy that car used? Did it come from the rust belt? Do you live near the coast? Rust buckets from up north frequently end up on used car lots down south. That car is nearing the end of it’s useful life.

Last edited by MParr; 05/03/20 07:16 PM.

2019 VW Tiguan SE 2.0 TSI Now: Castrol Pro OE LL IV 0W20 & OE VW
2020 F-150 STX Super Cab 2WD 2.7 Ecoboost. FF & OE filter
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420217 05/03/20 07:19 PM
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mattd Offline
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You’d have to have it blasted and see what is left to see if it’s really still suitable for use


2007 Ford F-350 4x4 6.0 PSD

ASE Master, L1, L2
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420220 05/03/20 07:20 PM
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MParr Offline
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Yep, four years of salt corrosion will do that.


2019 VW Tiguan SE 2.0 TSI Now: Castrol Pro OE LL IV 0W20 & OE VW
2020 F-150 STX Super Cab 2WD 2.7 Ecoboost. FF & OE filter
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420235 05/03/20 07:52 PM
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buddylpal Offline
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Originally Posted by GMFan
Car was assembled in Flat Rock, MI in Ford factory. This car is basically a Ford Fusion. I figured the rust wouldn’t be an issue since it was built in a Ford factory instead of Mazda factory. Bad luck of the draw with faulty sub frames. Based on what you all see am I okay for a while or does it need replacement. Thanks.


While it may have been built right along side with the Ford Fusion in a Ford plant, my guess is Mazda still supplied numerous parts for its own vehicles and this might be one of them. Ford just assembled it. From what I’ve gathered the Fusion doesn’t have this rust concern.

Inspect it, get a metal hammer and tap around on the suspension lightly to see how deep the rust is. Do you plan on keeping the car? If so then I personally would drive it for another year and this time next year I’d get the sub frame replaced. However, I’m not sure how cost effective it will be.


A couple GM's and a Hyundai.
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420237 05/03/20 07:52 PM
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Trav Offline
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You can needle scale it or wire wheel it then clean it off and spray it with Noxodul 700 inside and out. This is a long and dirty job but it will hold up for a long time, spray inside the rockers and rear quarters with the 700 also.

https://www.amazon.com/Noxudol-Rust...d=1588553287&s=automotive&sr=1-2


ASE L1, Master. Deutsch Meisterbrief.
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420238 05/03/20 07:54 PM
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buck91 Offline
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Looks pretty typical for a vehicle pushing 10 years old around these parts. Maybe even better than average.


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2011 F150 Scab 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Mazda Rear Subframe Rot - Pics [Re: GMFan] #5420277 05/03/20 08:36 PM
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Cdn17Sport6MT Online Content
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I dunno why exactly, but most of the vehicles I see with frame rust that is so aggressive as that have an origin in Japan. Having said this my '99 Camry - origin Japan (not Kentucky) is well nigh corrosion free on its subframes. However it has lived its life here in temperate Vancouver.

I have to think that subframes that rust like that ARE NOT simply due to a lack of proper prep / phosphating / e-coat... but rather due to improper steelmaking. The Japanese are amongst the best steelmakers - for pipeline steels,,but for low grade structural like this - generally I believe turn out poor materials. Others?

Last edited by Cdn17Sport6MT; 05/03/20 08:38 PM.

Mazda6 GX (i.e.Sport), 6MT, '17
Moto Guzzi 850 T5 (Euro version), '85
Honda Civic Si (EX 2 dr in the 'States), A/T, '97
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Toyota Corolla VE, 4AT, '99
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