Hi, Gavin. You’ve given us a good understanding of how to weigh the cost-benefit balance between refined and synthetic engine oils. Thanks for that. However, both are made from industrially extracted and processed chemicals, so why is one called “synthetic” and what are the magic ingredients that make it better? I’m sceptical.
The superior lubricating qualities of so-called “synthetic” engine oil are not about any magic added to it. It stems from what they leave out!
