The second graph look fine to me. It shows the relative difference of all the oils normalised to the best performing oil, which is used as a base line......the second graph just looks misleading.....
You can see by 2 hours the delo has almost double the weight loss compared to the reference (QS 5W40). You can also see that the M1 takes roughly double the time to reach the same point.
But nothing is hidden, the first graph is effectively the raw data in grams and hours.
Some people prefer raw data, some people prefer relative data. I'm happy to see both side by side.
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