Do you have an answer to my post of 1/5/2005? "Can anyone tell me what the by-pass valve differential pressure range spec. is for the Hyundai/Kia oil filter part number 26300-35501? (application 2002 Elantra GLS)" "Baldwin and Amsoil SDF20 are 18-20 lbs., while the Wix 51334 (which many people use) is stated as 11-12 lbs." Thank you Paul