I have a 2014 Toyota RAV4 with 138,000 miles on it. Not being that knowledgeable in cars, I never thought to get my transmission fluid changed. It’s a sealed transmission with supposed “lifetime” ATF. So I finally decided to get the fluid drained and refilled earlier today. My question was, since I never did it before and had put that many miles on it, should I get it drained and refilled again soon?