Going in for regular oil change at 75,000 miles. Dealer recommends changing differential and transfer case oil now, and wait for auto transmission fluid at 100k miles. None of these have yet been done. Obviously the maintenance guide says ‘never’ on the trans fluid (sealed unit etc), unless Special Operating Conditions (towing, car top carrier, heavy loading), then it’s every 60k miles. Differential and transfer case oil is also never unless special conditions, then it’s every 15k miles.
Car is driven under normal load conditions, no towing. Severe winters - Chicago area.
I know a little about trans fluid and the debate on that. I know nothing about diff or transfer case fluid changes. Thoughts on the dealer schedule vs Toyota, and doing the work now? Any unforeseen problems?