I replaced my radiator about a year ago because the top connection was leaking even with a new top hose. At the time I reused the Volvo coolant because it was still "Crystal" clear. I set the radiator aside for later failure analysis.

This year the coolant started to show a little rust color so I replaced it with the Volvo "all cars" stuff as before. (The previous stuff had been in about 4 years.)

I also got around to looking at the cause of the leak on the old radiator. The metal support sleave inside the upper connection had rusted and swoolen enough to split the plastic neck! The tanks themselves were fine. The external fins were very thin in spots from the NE road salts.
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'96 965 with 16' wheels at 117K. Had '85 745 Turbo Diesel for 200K.