I recently had my 88300CE serviced at the 82,500 mi. interval. Dealer svc mgr. told me about the seal starting to weep. Told me to keep an eye on it and if it got worse before the 90k interval to let him know. Otherwise it'll probably be done then, or later if not getting worse.

Mechanically, he said it's not a terribly big job. Not a teardown or anything. My guess would be maybe 4-6 hours at shop rates plus parts. Here the MB dealer rate is 80/85 per hr. My guess would be total cost by dealer to be in the 350 to 500 range. Maybe a little more

Some of the techs here would know better.