I know that oil color doesn't matter, and bla bla bla. But I don't care, I'm not Even old and from the 80s and stuck in my ways, I'm relatively young and grew up with modern engine oils. I still don't care, I'll never go over 4k on my 2uzfes oil (I'm aware the 2uz and go 10k mile oci's..). My oil is perfectly clean till about 2k miles then it starts oxidation, 3500 is when I usually do it. It feels good always having perfectly clean engine oil in my truck that I plan on keeping for the next 20 years. It's a 2001 and I plan to have it in 2040. I change all the fluids all the time because I want to and it gives me something to do. Yall can do your 8k mile oil changes all you want to save 32 bucks a year