quote:
Originally posted by garyvegas:
Mobil was bought out by Exxon a few years back and filed a suit against Castrol on their syntec brand because it was still petro basestocks but they labeled it synthetic, Mobil lost the suit..... the court ruled that if the dino basestock was refined enough it could be called "synthetic" so to make a long story short Mobil 1 is now a highly refined petroleum base oil just like Castrol Syntec even though mobil may deny it, it is cheaper to make and more profit...but again it isn't true synthetic anymore.......base oil's are labeled 1-2-3-4 and 5 now...... 1 is the lowest grade,5 is the highest........most oil's are now group 3....Mobil 1, Castrol syntec are group 4 and Redline is rated 5 because of it's poyol ester basestock the highest grade basestock there is, it is the same oil that it used in jet turbine's on 747's and the space shuttle....I'm not sure where Amsoil rates from 1-5........