at work, on a piece of equipment we use, it was suspected this machine was developing a bearing problem. These bearings slide on a film of oil pumped into them at 2600 psi. So we thought a bearing was giving up because the filter was becoming clogged very often. The company that sold us this equipment did the analysis for us and found all particulate levels at normal levels except for silicon which was elevated. Since this is a closed system I have no idea how or when silicon got into the oil? Does anyone have experience or knowledge on the subject? thanks.