have a look under the expansion tank before you refill to check if it has a minor leak and slip on an extra jubilee clip if not sure. also at the opposite end on the top of the radiator elbow is another known point of weeping. try carefully to retighten the elbow onto its oring or renew with a metal one. these are two items that cured a very similar coolant loss on my kv6 many years ago. keep searching you will find the cause eventualy.
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