Is it okay to mix regular and synthetic oil in a Ford Transit Custom?

I have some leftover synthetic oil from my last oil change, but I don't have enough to fill up the entire engine. Can I mix it with the regular oil that is currently in my Ford Transit Custom? Will it cause any harm or negatively affect the performance of my vehicle?

Mixing regular and synthetic oil is not recommended as they have different chemical compositions and can potentially cause engine damage. It is best to stick with one type of oil for your engine.

It is generally not recommended to mix regular and synthetic oil, but in your case, since you have a Ford Transit Custom, it should be okay. The engine is designed to be flexible and can work with a mix of oils. Just make sure to change your oil regularly.

Yes, it is safe to mix regular and synthetic oil in your Ford Transit Custom. In fact, some car manufacturers even recommend it. Just make sure to use high-quality oils and follow the recommended oil change schedule for your vehicle.