Hey Zack--

Glad you put up your oil system post. Good job.

And NC, nice followup. Amazing what's in those manuals.

I know you guys know this but here is a photo (I love posting photos) of two oil filters. The one on the left has no check valve and the one on the right does have one.

Notice the rubber flapper ring under the holes around the center hole. This is the valve and these holes are the inlet to the oil filter. So to make sure you have a check valve look for the rubber flapper.

Paul

[Linked Image]