I've ruined my car 🙁
I always found that the brands made a big difference to the length of them. One brand 6pk625 wouldn't fit and I had to get it changed for a 628 mm long oneThe old, worn & stretched 6PK825 alternator belt was starting to squeal occasionally under high loads even with the tensioner maxed out.
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So I brought a shorter 6PK815 belt
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And now it fits soo much better and the tensioner is well within it's adjustment range
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Sent from my SM-G903F using Micra Sports Club mobile app