Engine oil is surrounded by myths and misconceptions that have been passed down through generations of vehicle owners. Let us separate fact from fiction.
Myth 1: Dark oil means it needs changing. Truth: Oil darkens because it is doing its job — collecting combustion byproducts and contaminants. Color alone is not an indicator of oil condition.
Myth 2: You should always change oil every 5,000 km. Truth: Modern synthetic oils and engines can safely go 10,000-15,000 km between changes. Follow your manufacturer's recommendations and consider oil analysis.
Myth 3: Synthetic oil causes leaks. Truth: This was partly true decades ago when early synthetics could shrink certain seal materials. Modern synthetics are fully compatible with all engine seals and gaskets.
Myth 4: Thicker oil is always better protection. Truth: Using thicker oil than specified can reduce fuel efficiency, impair cold-start performance, and starve tight-tolerance bearings of oil flow.
Myth 5: You cannot switch between synthetic and mineral oil. Truth: You can switch freely between mineral, semi-synthetic, and fully synthetic oils without any flushing or special procedure.
Myth 6: Oil additives improve performance. Truth: Quality engine oils already contain carefully balanced additive packages. Adding aftermarket additives can disrupt this balance and may void your warranty.
Myth 7: New cars do not need oil changes. Truth: Even new engines produce wear particles during the break-in period. Following the manufacturer's service schedule is essential from day one.
Myth 8: All oils of the same viscosity are the same. Truth: Base oil quality, additive package, and manufacturing standards vary enormously between brands and grades.
Myth 9: You cannot mix different oil brands. Truth: While mixing is generally safe, it is better to use a consistent product for optimal additive compatibility.
Myth 10: Engine oil lasts forever if the car is not driven. Truth: Oil degrades through oxidation even when not in use. Vehicles in long-term storage should have their oil changed at least annually.
