Engine Oil Myths Busted: Is Mixing Oils Really Bad?
Car engines aren’t built for compromise. Still, life happens—you’re low on oil, the right brand isn’t around, and the only option is a different one. Mixing oils can be done, but only if you know the rules.
Stick to viscosity first. 5W-30 mixed with another 5W-30? You’re usually safe. Mismatch viscosities, and your engine’s lubrication balance takes a hit.
Brand loyalty matters. Different brands use unique additive packages. Mixing them occasionally is fine, but long-term use? It weakens protection.
Synthetic vs. conventional. Mixing them works in emergencies, but dilutes the advanced properties of synthetic oil. Think of it as putting tap water in bottled mineral water.
Check your manual. If the manufacturer specifies, follow it—because your warranty depends on it.
Bottom line: Mixing oils is like patchwork—temporary, not permanent. For consistent protection, always return to a single, trusted oil type like Caltex Havoline.
