Originally Posted by MidniteTRD

roger that, fair enough. UOA looks great, thanks for sharing! super low iron, if you're under 1ppm per 1000 miles that's impressive. most 4Runner UOA's show 2-3 ppm per 1000. iron is your valvetrain, timing chain...anything steel. given you probably had to drop an extra gear and climb the RPM's up at altitude that's great wear.

your copper and aluminum will keep dropping and level out at around 30-40k miles. that seems to be where most 4Runner UOA's show those values stabilizing and indicating its actually broken in.

i think you found your blend! i'd go ahead and run that 8-10k with confidence from here on out i might even pick some up for myself sometime...