Well, I spoke with Jerry Lemond this afternoon about something else, and mentioned the oil pressure delay. He was convinced it was the oil filter and not anything else. He told me to just change the filter with the OEM filter I had gotten from him a month ago and forget the base.

Guess what. As usual he was right and the OEM filter fixed the problem.

The NAPA filter looked and felt completely right, except the misssing o-ring and the feed tube is a bit smaller. Neither of thewse created a real problem though according to Jerry. The problem is apparently there is no check valve inside of these. The rubber thing we were talking about, the "flapper", is only one of two check valve devices in these filters. The one on the main feed is up in the top of the filter according to Jerry and is often left out by aftermarket manufacturers. So stay AWAY from NAPA and WIX filters for sure, probably all the others. Just buy OEM straight from Jerry or Isuzu.

Hope this helps someone else in the future...

NCDiesel