as I was reading the spiffy fram filter box, you have to go to the 10 $ filter to get the checkvalve flapper and it claims 3 or 5 micron filtration.

5 microns filters out bacteria from drinking water.
No Wonder they plug up and blow out, among other reasons.

If they simply didn't work at all would be better than melting and plugging everything.

Having said that, we used to put 't' fittings on oil sending units, so we could have a real gauge and the stock dash needle.

Gives me something else to look at when the hood's open.
super cheap and easy/ fast to do.