Definitely check what ATF has gone into it.Have you got previous service records to see what ATF was put in? (Valvoline Maxlife ATF ok its fully synthetic.)Had mine changed when under warranty by a so called expert who knew these Merc boxes well.On the way home blew heaps out of filler tube.Checked level and nearly a litre overfull!!This can stuff up these boxes.Just got from US B&M larger capacity pan with drain plug ,to make changes easier.
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