Hi Y'All, I'm new here, this is my first post. I have a CAT C-12 in a Freightliner FLD112. I just discovered that yhe C-12 came stock with two filter bases, one is for the regular full-flow filter, the other is for a bypass filter. I wondered what that other cap was for, and that's it. The truck was previously in the Penske fleet. I bought it with 269,000 miles on it, now it has about 305,000 miles. I installed the bypass filter yesterday, CAT p/n 1W-8845. Haven't gone anywhere yet. What should I expect from this bypass filter? How often should I change it? What are some things to watch for? I have been doing oil analysis at every oil change, I thought I'd pull a sample every 10,000 miles now and see how it goes. Thanks.