Myths and Facts about Engine Oils

Many drivers still rely on outdated assumptions about engine oil, often without realizing how much these beliefs can affect engine performance and longevity. Modern engines are highly engineered systems, and choosing the wrong oil can lead to reduced efficiency, increased wear, and costly repairs. Understanding the facts behind common engine oil myths helps drivers make better maintenance decisions and protect their vehicles over the long term.

Myth 1: All Engine Oils Are the Same

A common misconception is that engine oil is a universal product that works equally well in all vehicles. Since most oils look similar, many drivers believe price or brand is the only difference.

Reality:
Engine oils are specifically formulated for different engine designs and operating conditions. They vary in viscosity, performance standards, and additive technology. Using an oil that does not meet the manufacturer’s specifications can reduce lubrication efficiency and compromise engine protection. Choosing the correct engine oil is essential for maintaining performance, fuel efficiency, and durability.

Myth 2: Dark Engine Oil Means It Must Be Changed Immediately

Darkened engine oil often causes concern, leading many drivers to assume the oil has failed.

Reality:
As engine oil circulates, it collects contaminants and combustion by-products. This cleaning process naturally darkens the oil and is often a sign that it is working effectively. Modern engine oils are designed to remain protective long after their color changes. Oil change decisions should be based on manufacturer-recommended service intervals, not oil appearance alone.

Myth 3: Synthetic Oil Causes Leaks in Older Engines

Some drivers avoid synthetic oil in older vehicles, fearing it will cause oil leaks.

Reality:
Modern synthetic engine oils are fully compatible with engine seals, even in high-mileage vehicles. If leaks appear after switching oils, they are usually due to existing mechanical wear rather than the oil itself. Synthetic oils offer superior thermal stability, cleaning performance, and wear protection compared to conventional oils.

Myth 4: Engine Oil Must Always Be Changed Every  4,500 Kilometres

The 4,500-kilometre oil change rule is still widely followed, despite advancements in engine and lubricant technology.

Reality:
Modern engines and high-quality engine oils are designed for extended service intervals. Many vehicle manufacturers now recommend longer oil change periods based on engine design, driving conditions, and oil quality. Following manufacturer guidelines ensures optimal protection while reducing unnecessary maintenance costs and waste.

Myth 5: Thicker Oil Provides Better Engine Protection

It is often assumed that higher-viscosity oil offers stronger protection, especially for older or noisy engines.

Reality:
Engine oil viscosity must match the engine’s design requirements. Oil that is too thick may circulate poorly during cold starts, while oil that is too thin may fail under high temperatures. Using the recommended viscosity ensures proper lubrication, improved fuel economy, and long-term engine reliability.

Myth 6: Switching Between Synthetic and Conventional Oil Is Harmful

Some drivers believe that changing oil types can damage the engine.

Reality:
Switching between synthetic and conventional engine oils is safe as long as the oil meets the required viscosity and performance standards. Many modern oils already blend both technologies. The most important factor is compliance with the engine manufacturer’s specifications.

Why Choosing the Right Engine Oil Matters

Selecting the correct engine oil plays a critical role in engine performance, efficiency, and lifespan. Using the wrong oil can lead to increased friction, reduced fuel efficiency, and accelerated wear. Understanding common engine oil myths helps drivers avoid mistakes and make informed maintenance decisions.

For best results, always follow manufacturer recommendations or consult a trusted automotive specialist when selecting engine oil.