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Looks can be deceiving. Every one I've replaced has looked new also.
Regarding the leak/seepage you have observed, what kind of quantity are you seeing? You can get a good idea by dropping down the plastic cover under the engine and looking at how much has collected in the back part of the cover. If you see much in that thing after a couple of days of driving, that amount of leakage could be a problem.
One thing that I have used on both of our 960's is "Bar's Leaks". I put one of the larger sized bottles in each of the cars. The stuff I used is that dark brown stuff that come in a silver bottle. It does well at sealing small leaks and I have never experienced any adverse affects from using it before.
To keep it from gunking up the oveflow tank, I drain & collect about 1/2 gallon of coolant first to fully empty the overflow tank, then shake & pour in the Bar's Leaks so as to get it to go pretty much right hole in the overflow tank & down the hose to the block. Then I use the collected coolant to 'wash it down'.
Leaks of any amount are not very good as the slow seeping flow tends to cause some corrosion/pitting.
Congratulations on a successful timing belt change.
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