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The systemic toxicity of motor oil is considered to be low. Accidental ingestion of large quantities of motor ',i oil 'produces gastrointestinal irritation in humans with symptoms including nausea, vomiting and diarrhea. Repeated long-term dermal exposure in humans may produce skin y p kin rash and oil acne (USAF-IRP, 1990) . a Benzene PEL — 1 PPM, TLV — 10 ppm, EL — 25 ppm (10 min/8 hrs) , C m 50 ppm Benzene is a central nervous system depressant. Symptoms include headache, nausea, tremors, and fatigue, but these typically g yp ly do not occur until exposure concentrations are in excess'. of 150 ppm. There is significant evidence that chronic exposures are carcinogenic causing a progressively malignant disease of the blood-forming organs (leukemia) . i Benzene is poorly absorbed through intactskin'i, but contact with liquid benzene may cause blistering and dermatitii s. Benzene vapors rs can cause transient eye irritation. The mean air odor threshold for benzene is 12 ppm, which yields unsatisfactory warning properties. Benzene's ionization potential (IP) is 9.25 eV. Toluene PEL/TLV — 100 ppm, EL — 200 ppm (10 min/8 hrs) , C s 500 ppm Toluene is a central nervous system depressant. Symptoms include headache, nausea, dizziness and fatigue, but such symptoms typically do not occur at exposures below 200 ppm. Repeated and prolonged contact with liquid toluene may cause drying of the skin and dermatitis. Mild, transitory eye irritation may be experienced with exposure to vapors above 200 ppm. Toluene is not considered carcinogenic. Toluene's mean odor threshold is 3 ppm, which gives it excellent warning properties. rrToluene's ionization potential (IP) is 8.812 eV.' L Ethyl Benzene PEL/TLV — 100 ppm Ethyl benzene is an eye and mucous membrane irritant at levels well above i the TLV. Liquid ethyl benzene is a significant skin irritant, and can rcause defatting and blistering with repeated exposures. Vapor can cause i.r CHEVMERC.H50 12 C;