I live in Buffalo, NY, where it can get cold and stay cold for long periods of time. Summers can be hot. I bought my vehicle used from a Lexus dealer with 67,000 miles on it and am now at 85,000.
I have been running synthetic oil, but at the next oil change, I am thinking of going all synthetic, i.e., transfer case, dif, engine AND transmission. I have heard that you cannot run synthetic transmission fluid. Is this ture?