Disassembled jet engine

Effect of jet engine oil coking

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
  • Mist/vapor
  • Puddles
  • Dynamic

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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