They all have hydraulic suspension; pretty sure it's just rear leveling like in the 560SEL as well. All W140 V8s are the same M119 block just bored out; earlier models being much more difficult to maintain, having TWO distributor caps. I believe the later cars have full EFI.

Like previously stated, initial cost is the easiest with these. My Uncle purchased one when I bought the W126 from him; 12,000 original miles on an S420, and he still pays through the nose at the shop.

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1987 560SEL (210,000 miles)