Date registered: Oct 2012
Vehicle: Mercedes Benz W108 - 280 SE (1970) / Mercedes-Benz W123 200T (1983)
Mentioned: 0 Post(s)
Quoted: 12 Post(s)
Congrats! it sounds like a lovely car (post pictures!)
There's another thread here where lead additive is being discussed, it's still on the first page of this sub-section.
To sum it up, some people say it's not needed and some say it's a good idea to use. If you bought a six cylinder with fuel injection, then I'd use a lead additive. It lubricates the insides of the MFI pump and will give it a longer life. It also lubricates various other parts that wouldn't get lubrication with normal fuels too.
I run a 280 SE W108 and I was told to use a lead additive in it because of the above reasons. You cannot really go wrong with it as it'll just go through the engine and come out as exhaust smoke if it's not needed.