I was wondering...my neighbor brags on Amsoil Syn. all the time. I have used it and it is expensive. I was wondering if there was some rating system for determining which synthetic is of a higher quality than other synthetics? Someone on the board mentioned a group 3, 4 and 5.Is there a website somewhere that gives the ratings of synthetics or does someone know what other synthetic would be on the same par as Amsoil or is there one better than Amsoil? My neighbor puts Amsoil in his vehicles then he tries to run them 30k or 40K miles just changing filters, which seems dumb to me because a filter can't get out a lot of those oil pollutants. Then again I have a friend who only buys recycled oil (real cheap skate). I'm wondering how they get all that black stuff out of the oil to make it new again. Wish I had a filter that could do that.
Any helpful comments appreciated.
Any helpful comments appreciated.