i don't believe in any x-w-20 oils film is too thin for protection + only for very minor xtra mpg's. today almost all oils labeled "synthetic" in usa are highly refined mineral oil, not the man made in a lab of years ago. mobil I USED to be all PAO group IV oil, today its used sparingly, but the EP Mobil I reportedly still uses it. i am liking the new GTL Pennzoil Platinum series 10-30 being my choice with very low Noack. there's still the real deal Redline + Amsoil Group IV + V oils for severe usage. Amsoil 20-50 in my oil killing 106 cu in Victory Hammer, air-oil cooled engine with shared gearbox-engine oil. Amsoil's signature series car + light truck oils for yearly or 25,000 is my choice, a fresh Wix filter @ 6 months. Pennzoil Platinum 10-30 in other family members vehicles that i change their oil, retired with spare time i enjoy mechanic work in my heated garage, makes the Pa winter time pass more easily
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