Used regularly, I’d bet an early k-jet is less prone to failure or the need for maintenance. D-jets will likely have solid lifters and points each needing adjustment. Plus other parts more prone to failure. I do like the system better than a k-jet for some reason. Something very “vintage” about maintaining it.


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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,