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Old 09-21-2003, 07:22 PM
dtf dtf is offline
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Join Date: Jul 2003
Location: South East CT
Posts: 834
Start of the radiator break down?

I've just noticed a whitish- stain trail down the neck of my radiator neck on a M104 with 203,000 miles. Is this the start of the much publicized neck failure? Is it catasrophic, causing road side break down or gradual, just making a mess?
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (203,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles)
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (124,034 miles)
2014 E350 4Matic Wagon 48,000 miles
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Old 09-21-2003, 10:29 PM
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Join Date: Jun 2002
Location: Monrovia, CA
Posts: 490
It's my understanding that it usually happens very suddenly. The neck just cracks and separates without any warning at all. On a car with that many miles, it's probably a good idea to just replace it as a matter of preventive maintenance.

I bought my 86 300E a year ago last June with 94,000 miles on it, and the neck had already broken and been repaired with JB Weld and a piece of copper pipe. I replaced it with a new Behr radiator with the metal reinforcing sleeve in both hose necks and replaced the standard MB anitfreeze with Evans NPG+ coolant and I've had no sleepless nights for the last 30,000 miles worrying about it.

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