When I first got my "79" 240D it had a nailing condition when cold. I used a couple cans of Red Line and then added Pro Tec when fueling up for a month or two. The nailing cleared up after the additives and a little hard driving topped off with the Molly Lube treatment. I haven't used additives since then and don't plan too unless an anti algae treatment just for good measure.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"