When I was looking at one of these, and doing research, I remember hearing about having a troublesome engine: under-powered; single row timeing chain/rails, which are prone to breaking. I've also heard many people have updated these to a double row timing chain which would probably lead to a severely empty wallet...I'd say your better of with a 300se (proven to be a great motor) or a 420 (proven to be a great gas hog).

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1989 300E 144K