Any kind of reaction to exposure should be a warning sign. Dermatitus or worse can result. May be cumulative in nature. Seems the skins tollerance for petroleum based products has real limits. Wear the gloves rather than take the risk. Primarily more often a hazzard to everyday exposure usually. On the otherhand a person may not have very much initial resistance. Seems to vary greatly from person to person. Unfortunatley we never know our own tollerance level untill we have exceeded it. A combination of used vehicle fluids can really do a person in. Might be modern additives as I am not aware of as extreme effects in distant times. They may have just been masked though. Or blamed on something else. The odour may be the lesser problem for some.