Causing further confusion, there are conventional and full-synthetic ... differences” compared to regular oils. “Most of the high mileage oil will have a seal conditioner,” he said.

Causing further confusion, there are conventional and full-synthetic ... s been around the planet a few times. Is special high-mileage oil worth the extra price compared to a conventional lubricant?

So, we’ve compiled the best high mileage engine oil products in a shortlist. We’ve gone for a full range from synthetic engine oils to advanced conventional types. You can then decide for yourself ...

But the array of oils you’ll find lining the shelves today—regular conventional and more pricey synthetic, synthetic blend, and “extended life” and “high mileage” conventional oils ...