Not much difference in the oil weight there.. I'd just stick with the 5w-30 and monitor it. 7800 km's is kind of low for it to be consuming that much. In theory when it warns you that it's low it's exactly 1 qt from full. It may be the extreme heat you see but I would just change it now and watch it and see. I wouldn't be really afraid, and during an inspection they wouldn't be able to detect anything like that anyways.
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