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Stan, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3526
Experience:  Technical support engineer
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I have a 1988 420SL and I want to replace the high milage engine

Customer Question

I have a 1988 420SL and I want to replace the high milage engine with a used lower mileage. Can I replace my 420SL engine and gearbox with one from a 1991 420SE without any fitting issues? Are they compatible?
Thanks, Martin
Submitted: 3 years ago.
Category: Mercedes
Expert:  Stan replied 3 years ago.
Stan :

Hello Martin,
Please check the engine numbers- if first 6 digits match- engines are practically identical. There might be a need to switch the engine mounts and fan, in rare cases - oil pan as well. I also suggest to make sure that engine's own fuel injection and ignition systems are used

Stan :