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The reason older MB engines start harder than your JD tractor is probably because the MB is pre-chamber injection and the JD is direct injection. Direct injection engines are known to start easier.

I have a 40 year Case tractor with direct injectionand it starts easily without using the manifold heaters down to about 45*F.

Why MB chose to use pre-chamber injection instead of direct injection, I do not know. Maybe someone else can answer that question.

The newer MB are now direct injection.

P E H>>

Huh? I don't have a John Deere anything. I was answering Hickey's post on the subject which I thought was pretty clear. And MB used pre-chambers because it's quieter. Comparatively. And BTW, todays MB Bluetec engines have nothing much in common with tractor (or Isuzu truck) direct injection.

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Roger E.