Originally Posted by revhigh
Cheap .... and completely unnecessary .....
Why not change your coolant every 5000 miles too ??? Answer .... It's not necessary. You can believe you're doing your engine a favor by changing oil at 3000 and 5000, ESPECIALLY synthetic at 3000 ... but all you're really doing is wasting money. But it's YOUR money .... so go for it.
I prefer a more scientific approach, like using oil analysis.
Perhaps transmission oil should be changed every 1000 miles! Can't be too careful!
I'll go with the recommendation of the people that designed and built the car.