Yeah - that might be true - Fram is so cheap, they can afford to include o-rings - I won't use Fram - I use HiFlo almost exclusively - I will use K&N (they are made by HiFlo and use the same numbering - a HiFlo HF113 is a K&N KN113) - Fram is $8.50, K&N is $8 and HiFlo is $4 - Fram has been proven to come apart in use and damage engines, so I simply won't use them - won't use Champion spark plugs either.