NEW??? AC Delco oil filters

[Adger Smith]

Jackie,
Those filters are not designed for thick oil or hi pressure/volumn flow.(they are designed for 10W types) The plastic liner(frame) on the inside has some large windows. It replaces the metal tubes with holes. These windows are so big that when high pressure and/or thick oil tries to pass through the filter media it collapses the media into & through the windows. This collapse causes the pleated media to stack & the oil has flow through several layers of media. Sometimes it will cause a break through or complete collapse of the media. The filter is usually in line before any oil pressure gauge taps. Remember the flow is from the outside of the filter towards the center. For many years I always used AC filters when I have an engine breaking in on the dyno. I would always do my run in procedure ,change oil & put on a race filter. Screen type, Wix or Baldwin. When these plastic lined/framed filters came out I had trouble with the first one. About the same time I had a couple of circle track customers loose engines with these filter problems. I can't afford the problems they can cause so now I stay away from them. I think it is just another case where the factory engineers have found a way to cut cost & still have a product that serves it's intended use. I don't know of any new model factory engine that is designed for thick viscosity oil at high pressure. To further prove it I think if you do a little research you will find that the gauges in some of the new GM, Fords & Mopars are just an idiot light gauge. They may show pressure & keep the needle in the center, but they are reading from an ohms specific sender(like idiot lights use). No matter how much or little pressure you put on it it centers the needle. This has come about because of customer complaints of LOW oil pressure.
Just my .02 for free