Bo,

Many of us run our W124 4matics in 2Matic mode when all wheel drive is not needed. This helps to preserve the transfer case. Just flip the yellow test lever over and voila: you are in rear wheel drive. The 4matic light will come on, in the dash.

Regards,
Bob

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'94 E500 Anthracite
'92 300E 4Matic (donated to charity)
'90 300TE 4Matic