[blinkwatt]

You still have not recieved a CEL this whole time? Even a lighty bad oil seperator could trigger a CEL. Perhaps someone knew it a CEL light,found out the problem was too much to fix and sold it anyways. Does the CEL come on when you turn the key over? Do you have access to an OBD II reader? Even if someone cut power to the light you should still be able to read any codes it giving from the OBD II port.

Hope all works out! Good luck!