If everything is hooked up right, it should be low maintenance. The only problem I've ever had is air in the lines, and it sounds to me like you may be confusing air in the lines for diry injectors. If you put that much dieselkleen in the tank it will thin the oil out and there is much less restriction, thereby less chance for air to arise. On my old car, once I had everything sealed up properly I never had any problems. Drove it for more than 20k miles with no clogged injectors or a coked up engine. If you don't have clear fuel lines, you won't know if there is air in them. A clear filter won't tell you much.

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87 300D - Running on Veggie oil; 260,000 plus miles; Original #14 head