Originally Posted By: FetchFar
Originally Posted By: Garak
Originally Posted By: FetchFar
I told him he should at first just go out into the employee parking lot and swap out 50 Purolator filters and let us know how many were torn, as simple as that. I just got overly-complicated answers back after I proposed that, just posturing and CYA type stuff.
Exactly - this is all head in the sand type stuff on the part of Purolator. While they don't (and no filter manufacturer does) cover the use of improper speced oil viscosity or the wrong filter (based on their application guide), in reality, any filter that can't handle 20w-50 in Florida or the correct, 5w-30 in Saskatchewan in -40 C has some issues.
Go to the quick lubes and pick through their "garbage." There will be a big mix of usage patterns there, from guys changing every 3,000 miles with the exactly specified grade, to guys running 20,000 miles on a filter. In the end, unless the thing is packed with sludge, it should never have a tear. Meticulous records are great from a scientific perspective and in trying to trace the issue. But, there shouldn't be one tear, period.
The best part of going through the "garbage" at a quick lube is that they would see something important with their own eyes. Wix, Hastings, Fram, and others aren't being riddled with torn media. Even the Purolator sourced Motorcrafts seem to be immune. Yet, the Purolators get torn. So, if they find that the only brand of filters that are experiencing tears are Purolators when they pick through the ruins, they can go through their own "meticulous records" and see if they can piece together where they fell on their collective keesters.
Fram does that. They simply & easily collect oil filters randomly and check'em for any notable catastrophic failures to see if a pattern is developing. You make a good point about the media sludging, if present, will show if the filter was left in too long, yet it should be hard to break/tear the media on just normal dirty filters.
Any oil filter should be able to take a delta-p of at least equal to its bypass valve setting without damaging the media. For most oil filters, that's a delta-p of at least 10~12 PSI.