hmmm, for me, Mobil 1 EP. I have used Mobil 1 since 1983. I have used Mobil 1 more often then the sum of all the other synthetic oils I have tried. It's easy to find, priced at a price I am willing to spend and never had a engine fail or need rebuilding in any car that I have used it in on long term basis. I never buy new cars. I buy used cars, approx 5 to 10 yrs old and keep them until they are ready for the junkyard. Last car I junked out, the engine was still running great @ 320,000, but everthing else was falling apart on the car and the rebuilt trans was failing. I have never owned a high performance car, so I have not felt the need to try Redline, Neo or Amsoil. I may give Lubro Moly a try or GC next oil change....bottomline is I have confidence in Mobil 1