The Purolator is a solid design. It seems to have one of the tougher paper filter elements of the low-end filters and the bypass valve is built right into the cartridge. There are no internal sealing problems with this filter at all. There is an assembly string that is wrapped around the filter element, probably to hold it in place while the glue cures in the end caps. In the (one of the Purolator clones), the string was wrapped too tightly and had damaged the filter element. All the other Purolator-made filters (8 in all) had no trouble, and even the damaged one would probably have been fine. I usually go with these in a pinch or when recommending the cheapest oil filter possible.
1. The process usually begins with organizations pretending to save money by buying cheap oil filters and air filters with the false sense that all filters are pretty much the same.
Modern engines are very sophisticated, and that means that the parts that you put on them for servicing them and so on; it better be the right quality. Now, nowhere is this more important than in the oil filter. You may think that you’re saving a few bucks buying a no name, really cheap oil filter, but that may wind up biting you in the long run.
Are the cheap oil filters just as good?