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I had something similar, my Suburban 6.5 Turbo Diesel was getting CELs from what was probably cheap fuel (fuel was occasionally igniting at the wrong time) and I ended up switching brands and using Diesel Kleen. I haven't seen any issues since then, I won't say it's because of the fuel additive but diesel fuel in America is said to have a ridiculously low Cetane rating with a minimum of 40 when it should be 50. D.K. has a cetane boost in it.
I'm also going to try reducing the emissions in the 84 Caprice and maybe solve pre-ignition issues by using Amsoil P.I. (Performance Improver.) Dunno if it'll work but it may have done something in the Wagon since I got 10% higher F.E. on the last tank. If that doesn't work I'll use Seafoam; it does clean piston cylinders if you literally pour it in and let it soak then remove it. I did that it in a snow blower as the engine had been pouring black smoke out on startup. I also changed the spark plug at the same time and it no longer smokes.
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