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Can you post up a larger picture of the dyno plot? The reason I ask is because I noticed on the video at the end there are reasonably large differences in the air/fuel ratios, which will have some impact on results. Going by your posted plot, the differences don't look that much once the AFRs settled, but it is hard to tell because the picture you have posted is quite small...
In terms of oil temps, nothing wrong with 115-120C - RS4s run on average 110-115C in normal driving, under hard driving they will reach 120C+ easily. I once read higher oil temps generally mean more power (at the expense of engine durability).
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