GASOLINE DILUENT IN USED ENGINE OILS DISTILLATION METHOD: ASTM D322
GENERAL:
Some fuel dilution of the engine oil may take place during normal operation. However, excessive fuel dilution is of concern in terms of possible performance problems. There are two test methods available for this work: one based on distillation, Test Method ASTM D322 and the other based on gas chromatography, Test Method ASTM D3525.
TEST SUMMARY
The sample, mixed with water, is placed in a glass still provided with a reflux condenser discharging into a graduated trap connected to the still. The contents of the still are brought to boiling by applying heat. The diluent in the sample is vaporized and then liquefied in the condenser. The diluent collects at the top of the trap and the excess water runs back to the still. The boiling is continued until all the diluent has been boiled out and recovered in the trap. The volume is recorded.
