Coke is the solid residue created when oil undergoes severe oxidative and thermal breakdown at extreme engine temperatures. The higher the temperature, the harder, blacker and more brittle the coke/deposit residue. Did you know that severe coking can cause aircraft turn-back, lost revenue-generating hours, in-flight shutdowns and impeded engine performance?
Coking classifications include:
- Thin film
Explore each classification, what influences coking, as well as the battery of tests ExxonMobil Research & Engineering (EMRE) subjects engine oils to.
To learn more, please download the full technical topic below.
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Find answers to general ExxonMobil aviation questions or explore our other FAQ pages about jet turbine oils, hydraulic fluids, piston engine oils, greases and gear oils.