I am looking for the vapor pressure vs. temperature data of an automotive engine oil. Specifically, looking for the data in the range 100C to 150C or so. Can someone please help? Thanks.

TMC, it is not an easy question. Single chemical compounds (e.g., propane) exhibit a documented vapor pressure that varies with temperature.

Automotive engine oil is made up of a base oil (80-90% v/v) that would exhibit a wide variety of vapor pressure based upon its composition of alkanes, alkenes, alkynes, etc. Plus, the oil would have a variety of additives for corrosion control, stability, lubrication, etc. and each would have it own vapor pressure. Additionally, one needs to exam the vapor pressure the chemical exerts to air, nitrogen, etc. Most chemical textbooks would cover this subject. Best of luck.

Larry

Are you looking for a comparision test?

Thin-Film Oxygen Uptake (ASTMD-4742)

The Thin-Film Oxygen Uptake Test evaluates the oxidation stability of lubricating oils. A mixture of the test oil and chemistries found in gasoline engine operation (oxidized/nitrated fuel, soluble metals and distilled water) are placed in a test vessel, which is pressurized with oxygen and placed in a heated bath. Anti-oxidant breakdown is evident when the oxygen pressure in the vessel rapidly decreases. At this point, the induction time (break point) of the oil is recorded.

If so email me and I can send you a report based on the above test procedure.
Regards,

Jason Keranen
AZ-Syntheticlubes
email:az-syntheticlubes@direcway.com