http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm I thought this might prove to be interesting data to consider. (I regularly use both Amsoil and K&N filters in most of my cars....) Bill Elliott Urbana, MD -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.11 - Release Date: 1/12/2005