TL;DR: AMD's Ryzen Threadripper PRO 9995WX, featuring 96 cores and 192 threads, was overclocked to 4.9GHz using innovative cooling with BMW M4 and Toyota Highlander radiators. This setup outperforms ...
There are two likely suspects here. The first is a blown head gasket which is allowing the oil and coolant to mix. Sometimes this shows up as oil in the coolant, sometimes as coolant in the oil.