I have a 2014 VW Jetta 1.8T, sport edition. It has 140,000 miles. Oil changes are at recommended time intervals, and I run full synthetic. In between oil changes I sometimes have to add 1-2 quarts. During oil changes, im told there is no sign of oil leak. It also seems to shift hard sometimes or lag when accelerating.
Your acceptable oil usage has nothing to do with your transmission shifting.
Acceleration lag is another issue, but without the CEL illuminated, needs hands on diagnosis.
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VW recommends oil changes every 10k or annually, which seems like a long time to me. https://www.schworervolkswagen.com/blog/vw-oil-change-service-intervals/ If you’re adding a quart or two in 10k you have no reason to worry.
As for hard or lagging shifts, how long has it been since you checked the transmission fluid? How long since it was changed? You may just have low fluid. If that’s not the case take it to a good independent transmission shop.
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