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Back in the day, we used to put transmission oil in our scooter transmissions.
It's like 80W120 or something.
It's mainly for transmissions, not for engines or high moving parts!
Transmission oil on automatics often are required to be changed at 50k mile intervals in hot climates.
Some mechanics rub their hairs, when they see cars with 100k-120k miles, and never done a transmission oil change.
They know the oil will come out black, if it comes out at all. And automotive companies want you to do just that, since the transmission on most cars has a 100k miles (or less), warranty.
That means you'll either fund their service department when something breaks, fund their parts department, when it totally broke, or buy a new car.
The main reason for oil change is to get the dirty, particle ridden oil out. Most of it will be carbon. This carbon is wearing the transmission even more.
50k miles for a transmission (with synthetic), 7k miles for engine oil (synthetic), or 3-5k miles for regular oil.
Even if the manufacturer says 10k miles for engine oil change interval... same principle... They just want you to wear out your car.
The reason many people have cars running at 200+k miles, without rebuild, is because they do oil and filter changes at the appropriate intervals.
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