Royal Purple stuff causing blown engines & tranny failur

[D_Eclipse9916]

Mobil 1 is known for its thinner than rated viscosity, which would seem odd that you lost mpg. Royal Purple motor oil and tranny oil (MADE FOR YOUR CAR!!!!) is far superior the mobil 1 stuff. There are discussions about mobil 1 switching to a lesser grade base oil on pretty much every forum you can find.