TECH FOUND CORROSION ON REAR SUB-FRAME
DURING THE VEHICLE HEALTH INSPECTION FOUND RUST FORMING ON
THE REAR SUBFPĆE ON ALL WELDS AND JOINTS. TREATED THE
RUST WITH A 3 STEP NEUTRALIZER PROCEDURE. ALLOWED THE
RECOMMENDED TIME TO CURE AS DIRECTED AND APLIED A SEALING

PARTS--
16060Z
51483Z
10041Z
08180
• .....-DESCRIPTION.--.-RUST ENCAPSULATOR RUST CONVERTER
PRE PAINTING PREP
BRAKE CLEANER




I found this while researching a '08 DB9 service history. The car has under 15K miles.
Question, is this common, anything to be concerned about?


Regards.

 

this sounds horrible. Has the vehicle been exposed to a lot of snow, moisture or road salts during a large portion of the 15K miles?

 

The car is located in the New York/New England area. But so are a lot of other AMs. Just wondering if anybody has heard of this?

 

Sounds like a dealer make money scheme. All joints tend to collect surface rust, but that is a cosmetic issue, not a safety issue.

 

Bingo. That is what I was wondering. They also changed all the spark plugs at 10K miles/7years. Although that may have been the original maintenance schedule. Just seemed odd to me.

 

Was there a reason, like oil in the intake or sever idle issue?

Wondering why they would replace the plugs, as they do not go bad because of age.

 

Maintenance schedules list tasks as "xxxx miles or x years, whichever comes first"

In this case, time came before mileage. Every maintenance task on these cars will be done when the time comes, regardless of mileage.

 

I agree with replacing the plugs, that's normal maintenance. Would you rather the aluminum threads come out (galling) because they weren't changed for over a decade?

The corrosion could be surface issues or more serious. The car is probably great, just have a good inspection done!

 

I don't have an owner's manual yet, though Grant's book states plugs renewed at 70K miles. There isn't a time line mentioned. Galling is a point well taken and from that alone, 7 or 8 years might be too long. I agree, normal maintenance.


It was the corrosion thing that raised the red flag for me. The maintenance records on this car are for the most part very impressive with nothing spared.


Thanks for the replies.

 

Time vs miles is 10k miles per year. So 3 yrs or 30k miles, whichever comes first. Or 6 yrs or 60k miles, whichever comes first... rinse and repeat.

 

The problem with the db9/dbs v12's is that the plugs go bad from non use if the car sat, start and stopped alot, had pcv (oil fouling) issues etc. I had one db9 that went 53000 miles on original plugs, so I did coils at the same time to get rid of the low speed miss. 08 never needed plugs with 38k, dbs plugs were toast at 30k so I did that job too chasing a slight intermittent hesitation.

Four time aston owner here and do all repairs in house, so I have some experience with plugs/coils etc if you have questions.

Do you own a w126 as well? They are fantastic cars and one of my favorite all time classics.

Good luck with the purchase.

 

Also, much of the under carriage of the db9 is aluminum, however the rear subframe does appear to be black in color and probably steel, hence the rust. I have never seen one majorly rusted, but surface rust could happen I guess. Buying florida cars, I sometimes see slight oxidation on certain trim/ underside parts (crank pullies, under pan hardware, exhaust hardware, ebrake caliper hardware)which is from salty air and humidity, but nothing more and easily cleanable..

 

IMHO, This speaks more to lack of proper rust protection at the factory. All cars are dipped and painted at the factory. A properly maintained and cleaned car should not rust. My old Honda had over 200K miles with no visible rust underneath the car, and in its later years I did not even wash it

 

I had some surface rust on the rear steel subframe of my DB9, I treated it with a marine rust converter before aplying a coat of black paint and injecting wax in the tubing.

 

I always put anti seize on plugs, so I do not see this issue. Guess I am old school, my Cuda had the same plugs for well over 10 yrs, only changed them so I could say the car had a complete tune up when I sold it.

But, point taken on the galling/corrosion issue.