hello, i have a cis 300-24 170.000 km runs like hell, iīve tested it with 320 clk and no comparison clk "much a do about...
Perhaps differential and transmission, donīt know 320 specs about this.
Remember to overhaul the fuel distributor (new diaphragm!), iīve done this to mine 6 months ago and itīs like new.
Enzo