high mileage vs synthetic oil

[VX KAT]

Oops, my bad...since the link was different, I "assumed" it was different.

[psychos2]

I use carquest filters as they are made by Wix . shawn

[BeeVenom]

The one thing i became aware of is that the 'high mileage' oils tend to have additives that 'address' your oil seals. In other words, stuff in it that helps swell up 'old' seals and gaskets thus helping to prevent drying out gaskets and minimizing oil leaks. Other than that, don't know what else is different about them.