When they reclaim used oil, they vacuum distill it. Antifreeze and water would come out first even at atmospheric distillation.
Heavy stuff from the vacuum distillation would get discarded and would have any metals, etc. in it.
I've sometimes combined my brake fluid I replace with used oil.
Heavy stuff from the vacuum distillation would get discarded and would have any metals, etc. in it.
I've sometimes combined my brake fluid I replace with used oil.