I changed oil in the Cobalt a few weeks ago and since filter is a cartridge type I took a close look at old filter. It was in use for about a year and 10K miles (Penzoil full syn oil). OLM had just reached 0%. Anyway, upon inspection, ribs/fins on filter were wavy and not straight any more. Shined a light down the center tube and could see a hole, not a tear, about the size of a ballpoint pen tip. Contacted Purolator and they asked me to return it, at their expense, which I did. Received a reply yesterday from MANN+HUMMEL:
Quote:
We are in receipt of the above referenced cartridge oil filter recently returned to us with the complaint pleats. Further, with light a pinhole could be seen in the media. The filter was serviced for about 10,122 miles.
The returned filter was manufactured on March 6, 2013.
Physical inspection of the filter found its pleats slightly compressed. Microscopic analysis found a pinhole in the media. These conditions are likely caused from the filter approaching or exceeding its containment holding capacity. The L15436 filter is manufactured with a center tube. As long as the center tube is present, it will prevent the filter from totally collapsing.
We will retain the filter for 30 days prior to disposal.
Sincerely,
Field Services Department
MANN+HUMMEL Purolator Filters LLC
So bottom line, in other words, they are saying that their filter can not be trusted to last long enough for a manufacturer specified oil change interval. There is no telling how long it took for the pinhole to appear.
Quote:
We are in receipt of the above referenced cartridge oil filter recently returned to us with the complaint pleats. Further, with light a pinhole could be seen in the media. The filter was serviced for about 10,122 miles.
The returned filter was manufactured on March 6, 2013.
Physical inspection of the filter found its pleats slightly compressed. Microscopic analysis found a pinhole in the media. These conditions are likely caused from the filter approaching or exceeding its containment holding capacity. The L15436 filter is manufactured with a center tube. As long as the center tube is present, it will prevent the filter from totally collapsing.
We will retain the filter for 30 days prior to disposal.
Sincerely,
Field Services Department
MANN+HUMMEL Purolator Filters LLC
So bottom line, in other words, they are saying that their filter can not be trusted to last long enough for a manufacturer specified oil change interval. There is no telling how long it took for the pinhole to appear.