Larger oil filter causes lower oil pressure

[prodjay10]

When I changed the oil this last time I went with the larger of the two oil filters acdelco recommends for my 2002 5.3. I thought bigger equals better.

Well I noticed a drop in oil pressure right after the oil change. At idle 550 rpm and operating temp it was less than 20 psi on the mechanical gauge. Once I replaced it with the shorter oil filter oil pressure jumped back to 30 psi at idle and operating temp.

Y’all probably know this but I thought I’d share my experience anyway just in case. I thought I had messed something up.
Posted via Mobile Device

[sprint_9]

What filter did you go from and then to? I dont run AC Delco filters anymore due to lack of oil pressure and the switch to "e" core design. I use a Wix or Fram Ultra.

[prodjay10]

Pf61 is the larger filter
Pf46 is the smaller one

The smaller filter installed now does have the e at the end. Not sure of the larger one. I’d have to look at it.
Posted via Mobile Device