Introduction
Glycol contamination in engine and lubricating oils is a critical indicator of antifreeze coolant leakage and can lead to accelerated oil degradation, corrosion, sludge formation, additive fallout, and increased engine wear. Traditional methods for glycol‑in‑oil (GOIL) analysis, such as ASTM D4291, are time‑consuming, extraction‑intensive, and susceptible to matrix interferences. To address these limitations, ASTM D7922 introduces a faster, cleaner approach using derivatization and headspace gas chromatography. This application note demonstrates an ASTM D7922–based method using the PerkinElmer GC 2400™ system for sensitive, accurate, and high‑throughput determination of ethylene glycol (EG) and propylene glycol (PG) in new and in‑service engine oils, supporting effective oil condition monitoring programs.
Key learning points:
- Rapid GOIL detection: ASTM D7922 headspace GC enables fast, clean detection of ethylene and propylene glycol in engine oils without labor‑intensive extractions.
- High sensitivity and accuracy: Excellent linearity (R² > 0.9998) allows reliable quantification of glycol contamination from low to high ppm levels.
- Built for routine monitoring: Proven performance on real in‑service samples demonstrates suitability for high‑throughput oil condition monitoring labs.
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