I bought my Stillen kit used and the guy told me that he himself re-did the bearings and seals after he spun a bearing at a track day. After the installation, I got an oil cooler. When I went to put it on, I found oil in the air side after taking the IC off. I had to send it to Vortech for a rebuild... Self-contained oil units don't have that much in them (4 ounces in the Vortech) and if they are leaking, there's a really good chance that they empty themselves and you have a real problem.
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