82 300D turbo.

The other day was a hot day and I drove a little more aggressively than usual. On the way back:
I don't know if I am imagining but car sounds just slightly different than before. Slightly less smooth maybe a little more rough.

Also I checked the transmission fluid and the fluid comes up between the lines but only on the left side (vertically). On the other side of the stick the fluid does not reach the 2 lines.