Number one reason for oil change....contaminants. Contaminants in the oil is the main reason conventional oils were swapped out at 3000miles, as well as blended oils at 3000miles and full synthetic at 5000....no later. Look at the oil at 5000, its DARK brown to black. Cars are expensive enough, why get lazy and fooled into thinking 10,000miles is a-ok...it's not and it's pay back will hit you in your wallet.
I do my own oil changes on my 18 4Rnr, and my sons 07 4Rnr. I installed the Valvo Max oil drain system on both. Super easy and no spills. The only issue is my 18 with that stupid, stupid oil cartridge system, what a stupid design and major pain in the ass to deal with. The 07 4Rnr is sooooo easy in comparision.