I asked the Bosch shop I go to about this when I had my injectors rebuilt for the 82. They mentioned that if an injector is working properly and has been in operation for under 100k, do not touch it and that 'only bad things can happen'.

They were of the opinion that a preventative pop and spray test every 25k would be ok to do, but probably overkill, and if any showed issues to then clean them.

They thought the best preventative maintenance was to use a good injector cleaner additive (they carry Stanadyne stuff) or to use biodiesel at least occasionally.

dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car