New Owner: Hello, Thank You and Intro Maintenance Advice - Page 2 - Mercedes-Benz Forum
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post #11 of 13 (permalink) Old 06-12-2019, 07:17 PM
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If there are "deposits" that "break off", then that's a huge problem and the transmission is already toast. What can happen is that the friction surfaces on the clutches wear over time. Particulate in dirty fluid can actually help the clutches grab better. When you clean all that out, the worn clutch surfaces may not "grab" as well with the clean, slippery new fluid. You then get some slipping. Now, at 100K miles, the clutches in your transmission should be just fine. At 200K, I might be more concerned, but then again, a 722.6 that has 200K miles on the original fluid and filter probably doesn't have much life left in it anyhow.

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post #12 of 13 (permalink) Old 06-14-2019, 03:33 AM
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I have done the drain and fill procedure many times ,,,several times on each car over a period of six months , to gradually renew the fluid,,,
I never had a problem,,,
I would recommend you have it done ,including a new filter, pan gasket and new electrical connector bushing ,,then drain and refill the fluid again a month later.
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post #13 of 13 (permalink) Old 06-14-2019, 01:24 PM
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Originally Posted by nyteryda3 View Post
His thought process is that flushing the transmission can break off deposits and cause bigger problems. I read that some people doing the transmission service at higher mileage will do the drain and fill as opposed to the complete flush (I assume with a new filter and gasket as well still?). Is that the safer bet in this scenario?
My personal preference is a drain and fill with new filter and gasket. If you want to really do it up right, drive it about 500 miles and do another drain and fill.
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