Early S 600s had the 400+ hp engine which was later reduced in power to comply with new European emissions limits. Any good tech can reprogram the computer on later limited hp models to regain their original spec.

Early production W140s (first three years) are a nightmare.

Later production W140s (last three years) are a dream come true (even though they still had a few faults).

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]