The W140 has no engine jump start points because MB does not want you to jump start it on the first place. Actually, the owner's manual on my car (Euro version) completely advises against it.

If your battery is dead, they advise to charge it (without the car cables attached) or replace it.

Jump starting a W140 at least raises the chance from frying your alternator solenoids up to burning all electronics/computers.

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