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MB now want oil to be replaced in the 722.6 and 722.9 gearboxs once at 60,000km/40,000mi. This change came into effect in March this year. Personnally I would be changing the fluid every 100,000km/60,000mi regardless of how long MB think it can last.
Also make sure that there is a magnet in the transmission sump, the early ones didn't get one but we now put them in any time we have the sump off and it doesn't already have one.
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Alex.
MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32
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