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Thanks gl1647,
It would appear that the knock was very likely the tensioner and by compressing it and checking it you may have freed it up.
The crux of the matter is whether the noise was still there after the belt was placed back on track and only disappeared after the oil change. Even so this could have been coincidental.
Here we have another worthwhile experience to add to the useful evidence on the issue.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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