Anytime I come across someone talking about using DP I have to chime in. DP is snake oil. The only way to effectively clean your injectors is to take them apart and soak them in carb cleaner. It's too easy and for the cost of a can of carb cleaner (not the spray kind) vs DP, you can clean lots of injectors. For what I've seen, DP, unless your local parts store carries it, costs close to what you would pay for a can of carb cleaner when you include the cost of getting it shipped to you.
I tried DP once. The car still ran the same after it was run through the system. I then upon the advice of a senior member here pulled the injectors one by one pulled them apart and soaked each injector individually. Before soaking the injectors, I inspected all the parts. They were still dirty and this was just after running the DP. After soaking them in the carb cleaner, the parts sparkled like new. The car idled much better after cleaning them with the carb cleaner.
One last thing, while you're at it make sure you get new heat shields. You can't reuse them after pulling the injectors.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012