"In addition to the EGR in test mode, I have the PCV line in test mode and I'm evaluating that now. The oil cap does not get sucked down as before but it's not doing the tea pot dance either, it just kind of rattles a little bit. We'll most likely fab up some kind of oil separator since I was getting a lot of oil into the compressor intake elbow. "

By test mode do you mean that it is still on just not working? I am exempt from emissions testing BUT I still need to have the original parts on car. It also depends on who does the state inspection.

Please explain test mode, Also on your 300 does that have the same motor as mine? 603xxx

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86 300SDL. 250,xxx on #14 Head. One eye always on temp gauge.. Cruising towards 300K