[JFP in PA]

Originally Posted by Brucelee

I used to use M1 exclusively in all my vehicles. Then, they started to get cagey about whether they really were selling a true syn oil. Many (including me) believe they now sell a hydro-cracked version under the M1 brand, rather than the Group 4 formula they had been selling.

Hence, I moved to Red Line.

Who knows the truth or if there is a "truth."

Major draw back I have with Red Line oils is their lack of ACEA ratings (I've learned not to trust API since it switched from being a specification watchdog to a public relations arm of the industry); although I'll give Red Line credit for admitting it, unlike other brands such as RP, who have gotten caught more than once playing games with what ratings they hold...............