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My 'new' 1975 164E Start Up problems 140-160 1975

So here's the thing about the fuel, I have seen and read in three or more articles that the 3 litre was made to run with a high octane.
When I pulled the plugs two days ago they looked awful. Heavy carbon soot almost to the point that the gap wasn't visible. Soaked with gas and not that old, they were NGK R's, I could only assume that it would be necessary. Being that IPD sells a compression lowering head gasket kit for the 3 litre.
Is it all a bunch of bull? Or are these few people just mistaken?
Again, being really new to the quirks, I just want to be as well informed as possible.







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