Coolant Oil Analysis: Monitoring Health of the coolant and complete cooling system.

Coolant analysis is majorly performed for engines and associated Machinery. Coolant is a vital part of the Cooling Structure within the Engines. It can frequently be exposed to impurity, mixing, coolant dilution and oxidation due to high temperatures. The aim in coolant analysis is to monitor the health of the coolant and of the complete cooling system.

Role Of Coolants :

Critical purposes of coolant in the machining procedure includes:

  • Removing and reducing the heat in the Machines.
  • Reduce Friction by providing Lubrication
  • Flush away small abrasive particles
  • Prevent Corrosion

Over 40% of engine failure occurs due to a problem in the cooling system. Cooling system glitches can actually reduce the lifecycle of mechanisms within the systems. That is the reason why coolant examination programs emphasize on the coolants role in the overall engine health and attaining optimal machine performance and durability.

Coolant analysis helps to reduce downtime, minimize risk to equipment, avoid costly repairs and extends the life of the engines and associated machinery.

Analysis Includes:


Engine Coolant Grade Glycol (53 % by Volume Nominal)

Engine Coolant Grade- Glycol Based

Engine Coolant Grade Glycerin


53 % Ethylene Glycol and 53 % Propylene Glycol

Ethylene glycol base concentrate, Propylene glycol base concentrate, Ethylene glycol pre-dilute 50 volume % or higher, Propylene glycol pre-dilute 50 volume % or higher, Ethylene glycol base pre-dilute
containing glycerin 50 volume % or higher


Specification  Methods

ASTM D7713

ASTM D3306

ASTM D7640

Test Parameters


Chlorides, μg/g (ppm)

Glycerin, mass %

Color, Pt/Co scale

Sulfate, μg/g (ppm)

Methanol, µg/g

Relative density, 20/20 °C

Hardness, as CaCO3, μg/g (ppm)

Fatty Acids and Esters, mL 0.5N NaOH consumed per 50 g sample



Relative density, 25/25°C

Acidity as acetic acid, mass %

Iron, μg/g (ppm)

Water, mass %

Ethylene glycol, vol %


Ash, mass %

Propylene glycol, vol %

Relative density

pH, 50 % solution

Dipropylene glycol, vol %

Freezing point,

Chloride ion, µg/g

Other glycols,vol %

Boiling point

Sulfate ion, µg/g

Total glycols, vol %

Ash content, mass %

Nitrite, Nitrate, Phosphate (total, µg/g)

Freezing Point, °C (°F)

pH, 50 vol % in DI water

Silicon, µg/g

Glycol esters as acetic acid

Water, mass %

Iron, µg/g

Nitrite, Nitrate, Phosphate (total, µg ⁄g)

Reserve alkalinity, mL

Boron, µg/g

Silicon, µg/g

Effect on automotive finish (use clear coat thermoset
urethane or acrylic urethane finish)

Aluminum, Calcium, Copper, Iron, Magnesium, Lead, Zinc (total, µg/g)

Chloride ion, µg/g

Corrosion in glassware Weight loss, mg/specimen (copper, solder, brass, steel, cast iron, aluminum)


Sulfate, µg/g

Simulated service test Weight loss, mg/specimen (copper, solder, brass, steel, cast iron, aluminum)

Color, Pt/Co scale

Boron, µg/g

Corrosion of Cast Aluminum Alloys at Heat-Rejecting Surfaces, mg/cm2/week


Aluminum, Calcium, Copper,Iron, Magnesium, Lead, Zinc (total, µg/g)

Foaming (Volume/ mL, Break time/s


Iron, µg/g

Cavitation-Erosion (Rating for pitting, cavitation, and erosion of the water pump)


TUV India (TUV  NORD  Group)  as  one  of  the leading inspection, certification & testing organizations has state- of-the-art  NABL accredited Petroleum, Chemical & Gas testing laboratory  offering  a  complete range of testing facilities for coolant oil analysis and many others.


About The Author

Dipali Sanap

Officer-Marketing - Petroleum, Chemical & Gas Testing Laboratory
TUV India Pvt Ltd