Good point kanling. We don't know definitively that the short center tube found in many of Purolator's filters cause any harm. Conversely, it seems logical to theorize that the shorter center tubes represent a compromise in the structural integrity of the filter ... this theory is strengthened by the fact that the same Purolator filter (same part number) previously had a full-length center tube.
I suspect this flaw in Purolator's filters can be attributed to cost-cutting measures by Purolator. In developing strategy to reduce production costs I assume Purolator conducted a complete analysis to ensure their oil filters still maintained minimum standards of structural integrity.
I contacted Purolator regarding this issue, the following is the transcript:
My question:
Mr. Duvall,
I recently considered trying a Pure One oil filter (stock # 14477) for my 2005 Toyota Camry (2.4l engine), but after examining one of these filters close up, I'm starting to have reservations about their quality. While reviewing a few dozen Purolator filters in my local auto parts store, I discovered that most had a short center tube; i.e. the center tube doesn't completely extend to the top of the filter.
As stated, I was specifically looking at the Purolator 14477 (premium and Pure One). All filters for this application had the short center tube. I also examined several other sizes, some had the short tube, some didn't. For example, Purolator stock # 14476 (another filter recommended for Toyota 4cyl engines) did not have a short center tube.
This trend has been noted by many other consumers in a myriad of markets throughout the country. Consumers have taken note of this (perceived) defect and are concerned. Can you offer an explanation for our concerns?
Reply from Purolator:
The short centertube in the tall 65 mm filter was a result of part consolidation initiatives.. The tall 65 mm filter simply now uses the centertube from the short 65 mm filter thus eliminating a component part. This change was made about 1 1/2 years ago.
This design was tested extensively before the change was made and the performance of the filter does not suffer in anyway.
Regards,
Richard Hedgepeth
Product Engineering Manager
Arvinmeritor/Purolator
Though I am impressed with their responsiveness to my query ... I'm not as impressed with their explanation.
When they refer to the tall 65mm and the short 65mm I'm assuming that they are referring to filter diameter? Obviously this can't represent height as the "tall" and "short" measurements are equal.
And, "part consolidation initiatives" is definitely a production cost-cutting measure. Not that cost-cutting is always a bad thing, however in this case, my gut-feeling is that this particular initiative by Purolator represents reduced quality in these specific filters.
Considering the questionable construction of Purolator's oil filters I believe WIX represents a better choice.
