I sent mine to Larry at CIS Flow tech a couple years ago and 5 were good and one leaked, so I bought one.
A couple weeks ago, I did flow testing and all 6 were remarkably close at idle and at WOT. So 5 29 Yr old injectors are still flowing the same as my one new one. Larry did his magic with cleaning them, so maybe that helped, but for now, no reason for me to replace.
I think it also speaks to the proper care, use and gas the prior owners of my car used. If it sat for years or regularly used bad gas, I am sure I'd have to replace them all by now and many of these cars do sit.
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1988 930 Venetian Blue
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