Originally Posted by Teal97 
mainly M1 10w-30 until last year. read around the bitog forums to discover that M1 isn't a fully synthetic after all. so, feeling ripped off @ those fully synthetic prices, i switched to castrol syntec blend 10w-30. add to that, the VE burns a lot more oil than the DE ever did
, and it's a no brainer to switch to a less expensive high quality oil. i'll probably pack 3 quarts with me on the ~3000 round trip to LA and Vegas. hope to come home with ~1/2-3/4 quart left.M1 is group 3 like almost all the other oils listed on this thread. Off the top of my head the group 4 (true synthetic) oil are RP, Redline, Enos, Amsoil, and German Castrol.
Mobil1 is still a good oil just way overpriced compared to other good oils on the market. I myself use walmart supetech filters and walmart supertech synthetic 5-30. It's group 3 just like M1. It's worked great for me and I've been running it for a long time now.
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