Oil Degradation
Engine oil naturally degrades over time as it is exposed to heat, oxygen, combustion by-products and contamination. Understanding how and why oil deteriorates is essential for protecting diesel engines, reducing wear and extending service life.
This section explains the science behind oil oxidation, additive depletion, viscosity changes, sludge and varnish formation, soot contamination, fuel dilution and other factors that reduce lubricant performance. You'll also learn how oil analysis, effective filtration and real-time oil condition monitoring can identify degradation before it leads to costly engine damage.
Whether you maintain diesel generators, commercial vehicles, hydraulic systems or industrial machinery, these practical engineering guides will help you understand what causes oil degradation and how to maximise lubricant life and equipment reliability.
What Causes Oil Aeration and Foaming?
Oil aeration and foaming reduce lubrication quality, increase oxidation and accelerate engine wear. Learn what causes trapped air in engine oil and how to prevent it.
Why Does Engine Oil Lose Viscosity?
Engine oil can become thinner as well as thicker during service. Discover the causes of viscosity loss, how it affects engine protection and how to detect it before serious wear occurs.
How Do Engine Oil Additives Become Depleted?
Engine oil additives protect against wear, corrosion and oxidation, but they are gradually consumed during service. Learn how additive depletion affects engine protection and oil life.
What Causes Oil Acidification?
Oil acidification gradually reduces engine oil's ability to protect against wear and corrosion. Discover what causes acidity, how TAN and TBN change during oil life, and why monitoring oil condition is essential.
What Is Engine Varnish?
Engine varnish is a hard, lacquer-like deposit caused by oil degradation. Discover how varnish forms, why it's harmful and how effective filtration and oil condition monitoring help prevent it.