[Tcoat]

I am pushing 100K and have not had the tranny nor dif oil changed. I probably won't unless I start to notice a difference in their performance.
If really pushing the car on the track then you need to change it (and fairly often) but in a street driven car that is not used as a race car but just as a car the tranny and diff fluids are just fine for many many miles.


I change my oil at the recommended rate and no sooner. Again if pushing the car you may want to do it early but even at the highest recommended rate the oil on my street driven car looks about the same coming out as it did going in so 3,00 to 5,000 miles would be gross overkill for me. Ya, in the good old days of basic oil you needed to change it often but modern fluids last way longer. I feel a lot of people change them way more often then required because it gives a sense of doing something more than the reality that it needs it.


Other opinions will vary!