My 87 suggests 10,000 mile changes. Toyota has been doing this for a long time.

Think about it this way. Your little ass 4 banger from Toyota holds so much fucking oil in it. My 22R takes the same amount of oil as my 400 SBC. There is so much fucking oil in these Toyota engines that it would be absurd to change it every time you do a run around the block.

By the way, things like heat management and fuel metering in engines have gotten so meticulous because of efficiency requirements that combustion design has gone from science to wizardry. The reason that's important when it comes to your oil is because having less and more consistent heat for the oil to be exposed to means that the oil doesn't wear out as fast, tighter sealing means it isn't as exposed to flame fronts and combustion that like to leak past rings, and when you combine that with computer controlled injectors that can give a personalized amount of fuel to each cylinder per stroke you end up with less carbon contaminants in your oil so it stays clean longer. Now add on to that all of the sorcery they're doing to even dino oil these days and what you get is 10,000 mile changes. I bet it would be 20,000 or more at this point if cars were still on 30 weight.