Like a white wine?Esters? I've smelled some that have a wine like smell and I'm not talking about that imitation grape smell that is added by some.
Most esters have a pleasant smell and various esters give fruits their characteristic odor. Here is a chart I found once:Ingersoll Rand Ultra Coolant for their screw compressors smells like coconut. Some of the Sullair oils have a similar smell.
I'm asking not because I want a nice smelling dipstick, I work in a CNC machine shop and we use neat/straight cutting oils and hydraulic oils. The smell is not contained to a somewhat sealed tank, the who shop can smell like the oil.