Hey Scotty
I have bought a 2015 Toyota Corolla LE from USA to drive it in the middle east (Oman) where there is a huge temperature difference between the countries.
Should I be using a slightly thicker oil than the recommended one?
Also, is it a good idea to change the transmission fluid when the car has already 150000 miles on it?
Should I be using a slightly thicker oil than the recommended one?
No, use only the recommended oil.
Page 547 of the owners manual: https://ownersman.com/manuals/2015-Toyota-Corolla-owners-manual
Follow the oil recommendations of the manufacturer, which will state different oil for different ambient temperatures if needed.
See the FAQ for information on changing transmission fluid.
there is a huge temperature difference between the countries.
there is no difference in engine operating temperature
