Was checking to see if there was oil in my coolant since last two UOAs had Potassium at 17 and 18ppm. No oil noted by lab. Sample from top of radiator at 64k miles on 75% factory fill Lexus/Toyota Pink SLLC, 25% newer SLLC from radiator drain and fill around 55k - about 1 gallon drained out of radiator with 14 to 16 qts total in system.
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