Should I flush transmission - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 12-16-2014, 09:34 AM Thread Starter
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Should I flush transmission

I have a newby question regarding my 2003 C240 4MATIC. I bought it 1 year ago with 52K miles - it now has 100K miles. I go to an indy mechanic who is great, but I'm gun shy about flushing the transmission after an Accord transmission went years ago, after a flush.

So, I'm trying to weigh the risks of NOT flushing as opposed to the risks of flushing. Prior to buying the car last year it was driven very little, now I'll be putting 40K a year on it (roughly). Any thoughts on either side would be appreciated.
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post #2 of 4 (permalink) Old 12-16-2014, 09:40 AM
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You should change ATF but not flush it.
I think you have 722 transmission?
But regardless what you have - dropping the pan, wiping it clean, filter/gasket change, new pilot bushing combined with replacing about 40% of ATF is perfectly safe and should be good enough for at least 50k.
If you want to go farther, you can buy about 12 l of ATF and after doing the above, disconnect cooler hose and start the engine for few seconds, catching old ATF at the hose.
Repeating refilling/draining 3-4 times will give you close to 100% fluid exchange in safe way.
Shops do power flushing without pan drop, what is very cheap for them, but can be very expensive for the owner, when dirt from bottom of the pan is pushed into transmission.


Last edited by Kajtek1; 12-16-2014 at 09:45 AM.
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post #3 of 4 (permalink) Old 12-16-2014, 11:16 AM
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Honda transmissions are notorious for failure.

Now Honda is saying their transmissions are sealed for life. My sister in law is on her third transmission in a 2003 Odyssey at 152,000 miles.

An ATF change is not a flush, but it should be done MB has now gone back to doing service intervals for their transmissions.
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post #4 of 4 (permalink) Old 12-16-2014, 11:23 AM
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Quote:
Originally Posted by bencollier82 View Post
I have a newby question regarding my 2003 C240 4MATIC. I bought it 1 year ago with 52K miles - it now has 100K miles. I go to an indy mechanic who is great, but I'm gun shy about flushing the transmission after an Accord transmission went years ago, after a flush.

So, I'm trying to weigh the risks of NOT flushing as opposed to the risks of flushing. Prior to buying the car last year it was driven very little, now I'll be putting 40K a year on it (roughly). Any thoughts on either side would be appreciated.
i would have changed the fluid and filter when you got it mercedes says 39500 miles first service i change my fluid and filter every 40k with synthetic and my older ones with dex3 at 30k and have not had any failures
i do not flush my trans i change fluid and filter before it gets dirty

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