thanks for the input guys, the only reason I say it had to have orange and green coolants mixed was due to the fact that there was so much sediment or 'precipitate' in the system that someone either vandalized the system by putting sand in it, or it was b/c coolants were mixed in significant quantities.

the surprising part is that it ran well, no over heating, nothing, just some noise under the dash when reving engine.

any further input is welcome.

97 Montero SR w/Mitsu Adj Shocks & Rear Diff Lock ARB Front Diff Lock 4.9 Ring/Pinion 3.15 transfer box 43:1 crawl ratio 2" suspen lift 2" body lift 2" Gas Tank Lift 35x12.5 MTRs 15x10 Wheels Rock Sliderz ARB front bumper w/12k winch Custom rear bumper