We bought a used 2005 Toyota Highlander. Even at 5,000 miles since the last oil change the oil on the dipstick looks brand new. Every other car I have (and some fairly new) the oil is black.
Although reading up on it, black oil is not necessarily bad in a car, I guess different engines do different things to the oil color. But it still looks impressive on the Toyota.
So far no issues with it either. Although I did notice some decaying rubber boots (lower control arm vertical bushings or something). Looked up the faults it will cause (thumps at stops and vibrations at speed). It still rides fine with no symptoms, but that will be up for repair.
I add Moly-Kote (Molybdenum DiSulfide) to my freshly-changed 3,000 mile oil, to keep a lubrication coating on all metal parts. It’s black and looks like old oil, but smells distinctive and never overheats. The engine stays cool.
My previous 2002 Jeep Grand Cherokee Laredo went 395,000 miles before an engine replacement was necessary.
I now have a 2019 Jeep Grand Cherokee Supercharged V8 HEMI, and use Moly in each 3,000 coil change.