e 320 4matic?
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Joined: Jan 2001
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From: Chicago Burbs
all wheel drive. 
heres from MBUSA.com
"4MATIC™ all wheel drive with 4-wheel Electronic Traction System (4-ETS) Optional 4MATIC features a permanent 35/65 front/rear torque split via a planetary center differential. 4-ETS monitors speed of all four wheels to detect wheel slip, then applies individual brakes as needed to provide the effect of locking the front, rear and/or center differentials, and/or reduces excess engine power. 4-ETS continually balances the torque split to ensure that power is sent to the wheel(s) with traction. 4MATIC also incorporates the functions of ESP and ASR"
heres from MBUSA.com
"4MATIC™ all wheel drive with 4-wheel Electronic Traction System (4-ETS) Optional 4MATIC features a permanent 35/65 front/rear torque split via a planetary center differential. 4-ETS monitors speed of all four wheels to detect wheel slip, then applies individual brakes as needed to provide the effect of locking the front, rear and/or center differentials, and/or reduces excess engine power. 4-ETS continually balances the torque split to ensure that power is sent to the wheel(s) with traction. 4MATIC also incorporates the functions of ESP and ASR"
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