No issues with the non e-core PF64 filter I run on my LT4 CTS-V. Our Escalade is covered under Cadillac's premium care maintenance program and they run the PF63E Delco filter. At 33K miles and 5 oil changes later, no issues with the PF63E, but if any damage occurs due to the e-core oil filter, GM will have to cover it as I only take the car to the dealer for all it's maintenance and they have all the records. They can't deny anything warranty wise.