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Like a white wine? There is a particular ashless and light colored AW/AO additive, some sort of alykl phosphate (not metal containing like ZDDP) is in the products I know have this sweet smell, I just haven't been able to pin down the chemistry for sure.

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.

Hi all I'm dying to know what gives certain oils, mostly water-white and zinc-free oils like chevron clarity hydraulic oil it's pleasant sweet smell?

The Originally Posted by Imp4 This is the definition of chasing one's tail.... Change it out once it starts to stink, even after filtering. Otherwise, too many variables to have an intelligent discussion. The thing is in a cutting oil application the oil will be loaded with metal fines well...

Ok I have a bit of a different one; Anyone know of any practical resources for determining how and when additives are forced out of oils by a centrifuge or filtering? We use a straight cutting oil in machines cutting metal, the oil drips of the metal scrap and gets put back in the machine...