1). In general, a basic bolt-on like a catch can won't have an effect on your truck's overall powertrain or bumper-to-bumper warranties. However, all warranty decisions are up to individual dealerships, and your best bet would be to talk to your service center directly. 2). The amount of fluid caught by the can can vary immensely depending on climate, driving style, and variations in PCV system operation. Here in Arizona, for instance, we usually only capture actual oil with very little atmospheric moisture, and very rarely have to empty our cans. Trucks in places with more humidity or more mild climates in general will capture both oil and atmospheric moisture and will require emptying the can more often. 3). We generally recommend a catch can system of sort for long-term longevity.