Toyota synthetic motor oil, although made by Mobil 1, has a much stronger add pack than the off the shelf Mobil 1 5w-30. The TGMO 0w-20 also has a much higher viscosity index than the off the shelf Mobil 1. Toyota had back spec'd the 4.7 liter v8 to take 5w20 so with the colder weather I'm positive it will be fine
