Why is there a change in Case material from Cast iron to Aluminum/alloy?
Specifically the W116 transmissions, 73-5 cast iron to 76-80 Aluminum? Strength? weight? Economical influences? Which is better?

just silly don't know, so I should ask type stuff...

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2002 E430 4matic (212,000km)
2002 ML500 'sport'

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