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newsEffects of Glycol in Oil

Effects of Glycol in Oil

​​​​​Glycol in Oil​​​​

​Mechanism and Detection


Why is it important?

Major Diesel OEM:

"53% of catastrophic engine failures are due to coolant leaks."

How does Glycol anti freeze in motor oils damage the engine over time?

  • Defective or deteriorated seals
  • Improperly torqued head bolts
  • Thermally warped or cracked cylinder heads
  • Cracked block or cylinder head from frozen coolant
  • Cavitation erosion/corrosion of cylinder liners
  • Electrochemical erosion
  • Damage or corroded cooler cores
  • Water pump seal failure and weep-hole blockage


 How to detect Glycol anti freeze in motor oils

​Field Testing
  • ​Visual Inspection of the Filter
  • Blotter Spot Test
  • Patch Test
  • Schiff's Reagent Test

Laboratory Analysis

  • ​FTIR
  • Gas Chromatography
  • ICP Spectroscopy

 Removing Glycol Contamination

    1. Drain oil from compartment and all lines and components.
    2. Install new filter elements.
    3. Mix an ISO VG 32 R&O mineral oil 50/50 with Butoxy-Ethanol
    4. Use the mixture to turbulently flush (using an external pump installed at the turbocharger supply line or other suitable pumping method) internal surfaces by ample flow and volume for one hour at a temperature not less than 70°F (21°C).
    5. Drain the system completely, mop out crankcase and replace filters.
    6. Repeat steps 2 through 5, using a 60 percent R&O 32, 40 percent kerosene mixture.
    7. Remove and inspect all main bearings, journals and other engine surfaces.
    8. Remove the external pump and recharge with the correct lubricant. Replace the filter.
    9. Monitor the engine carefully until all conditions stabilize