I have a 2019 Mazda CX-9 AWD with 8k miles on it. I have looked for transmission oil change information in the owner's manual and there is no mention of it anywhere. The car doesn't have a transmission oil dip stick either. Is this car truly a no transmission oil change for entire life? I have difficulty believing that for example after 15 years and 200K miles on it, that it doesn't need a trans oil change. Also, regarding rear differential and transfer oil, it states only that after submersion in water, to change those oil. If you believe these 3 components should have oil change intervals, please tell me. Thank you.
All fluids wear out over time. And all fluids should be replaced at regular intervals depending on the fluid. There is a way to check and change the transmission fluid but you will need to find the fill plug and get a clear plastic hose and funnel to get fluid into it. It is better to change the fluid versus having it flushed. You wont get all the fluid out but it will certainly be better than doing nothing.
Ignore the "fluid will last the lifetime of your vehicle" nonsense. All that means when your tranny dies is that they will say "well the fluid lasted during the lifetime of your car. Now that it died would you like to look at a few of our new models?".
Don’t believe the “sealed for life” nonsense. For the transmission, I would drain and fill (and change filter if applicable) every 40,000-50,000 miles to prolong the life of the transmission. Also, not a bad idea to do the differential and transfer oil around the same time.
