Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
the main issue is the Mercedes practice of not replacing the transmission oil / fluid , as their practice of 'sealed for life' basically means the life of the torque convertor.....
if you replace the oil with fresh every 40-50K miles then the transmission will all last considerably longer
and the 420 engine variant is no longer available at couldn't be made to pass the latest Euro 6 emissions standards
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