Here's why:
* Different chemical compositions: Synthetic and regular oil have different chemical compositions and properties. Mixing them can create an inconsistent blend that may not perform as well as either oil alone.
* Additives: Oils contain additives that are designed to work with the specific base oil. Mixing different types of oil can disrupt the balance of additives, potentially leading to reduced performance or even engine damage.
* Viscosity: Synthetic oil typically has a higher viscosity than regular oil. Mixing them can create a blend with an inconsistent viscosity, which can affect the engine's lubrication and performance.
* Warranty: Some car manufacturers may void your warranty if you mix synthetic and regular oil.
Exceptions:
* Emergency situations: If you are in an emergency situation and absolutely need to add oil, you can mix a small amount of synthetic oil with regular oil. However, you should change the oil as soon as possible and use the recommended type of oil for your engine.
* Blends: Some oil manufacturers offer pre-blended synthetic and regular oils, which are specifically designed to be mixed.
Best practice:
Always consult your owner's manual for the recommended type of oil for your engine. Use the same type of oil throughout the life of your engine to ensure optimal performance and longevity.
