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C240 transmission fluid change after 250k

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C240 transmission fluid change after 250k

 
Old 03-15-2019, 02:13 PM
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2003 c240 wagon (w203)
C240 transmission fluid change after 250k

So, I inherited a 2003 c240 wagon with 249k on it. My step father has done all the maintenance since he got the car with 65k miles on it. The car runs well, but I'm about to drive from southern Oregon to Fairbanks, AK, so I'm trying to prepare the car. I took it to a reputable import shop, and they recommended a trans flush. Unfortunately he's followed mbusa guidelines, and has NEVER changed the tranny fluid. I'm curious as to whether I should 1. Do a full flush, 2. Just change the filter and fluid that's in the pan, or 3. just leave it alone due to the fact that it's never been changed. There's a few posts on this topic, but none about this high of mileage. Any suggestions will be extremely appreciated, as I obviously don't want a catastrophic failure during my 4k mile trip through the middle of nowhere. Thanks guys.

Last edited by Lindsay Carter; 03-15-2019 at 02:17 PM.
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Old 03-17-2019, 06:56 PM
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A fluid change would be best. No need to do a pressured flush as they say that may clog some passages.

A slightly more lazy way of doing this would be to drain the pan and filter a few times (2-4x).

In any case, leaving it alone would be a bad idea. The fluid definitely goes bad over time. I remember the drained fluid being brown/green instead of red.
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Old 03-17-2019, 07:25 PM
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Thanks slammer! That's what I was thinking as well. I even got two new filters so I have a fresh one after all the drains.
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Old 03-19-2019, 12:42 PM
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Update! Drained the fluid, dropped the pan, changed the filter, and refilled. Drove for 5 miles, then changed the fluid again, drove, and changed the fluid a third time. I also reset the trans electronics and she's driving like new. I'm gonna drive for a week and then change the filter again. Just want everyone to know, sealed for life is complete bs. There was Amber fluid in there, and it was totally degraded. Change your trans fluid. NOW!
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