But here’s the uncomfortable truth: many service centres operate with limited transparency about oil selection, and often prioritise inventory turnover and quick service over optimal customer outcomes.

This is why you should be aware of the three biggest myths surrounding engine oil that might be costing you money and potentially harming your vehicle.

Myth 1: You need to change your engine oil every 5,000km

This is one of the most widely trusted statements out there – and it is no longer true. This myth persists because our brains love shortcuts to avoid complicated decisions.

The reality is more nuanced: you might be changing your engine oil too frequently and thereby wasting money – or not frequently enough, which could risk engine damage.

The 5,000km rule may have been relevant in the past, particularly for older vehicles with conventional oils. However, modern engine technology and synthetic oils have made that rule obsolete.

Today, how often you need an oil change depends on multiple factors: Malaysia’s driving conditions such as stop-start traffic during commutes; the effects of tropical heat and humidity; even oil grade and quality, and the condition of your engine.

Higher-quality oils can last between 10,000km and 20,000km, or as specified in your vehicle’s manual; while frequent short trips may require you to stick to the lower end of your manufacturer’s recommended range.

To keep things easy, it is best to follow the recommendations of your vehicle manufacturer.

Myth 2: Switching oil brands harms your engine

Engine damage is among the most expensive issues a vehicle owner can face. So, even if a better oil is available, the fear of “messing things up” by switching brands tends to hold us back.

But here’s the truth: switching oil brands is safe and won’t harm your engine, as long as it’s done correctly.

Some drivers assume expensive international brands are superior to local options. In reality, regardless of the brand, the right engine oil will perform the same functions for your vehicle.

Certification bodies like Sirim exist to ensure different brands meet the right standards. A locally certified oil that meets your engine’s requirements can protect your engine just as effectively as a premium imported alternative.

Myth 3: Synthetic engine oil is bad for your vehicle

This might be the most misunderstood statement of all. The word “synthetic” makes it sound artificial or fake, triggering our psychological bias for “natural” products.

While conventional oil is refined from crude petroleum, synthetic oil is engineered to achieve specific performance characteristics by chemically building molecules from scratch.

For Malaysian drivers, synthetic or semi-synthetic may be a better option than conventional engine oil. Both serve the same purpose, but synthetic oil is designed to perform better under extreme conditions, last longer, and provide more consistent protection.

It offers superior thermal stability and resistance to oxidation, which means it maintains its protective properties even when your engine is working harder.

Synthetic oil also requires less frequent changes, potentially saving you money over time. Given Malaysia’s traffic, heat, and humidity, it’s often the better choice.

That said, synthetic engine oil tends to be more expensive, but the performance benefits are often worth the extra cost, especially if you wish to avoid costly repairs down the line.

No matter what type of engine oil you use, one critical concern remains: counterfeit products. Imitation oils look convincing but can cause severe damage, leading to costly repairs or even total engine failure. So, it’s always best to look for those that are Sirim-certified.