New member, first post. There may be other posts on this topic, but I couldn't find them. I'm trying to quell some paranoia based on what I'm seeing in the drain pan when I change the oil in my wife's 2015 Corolla vs. what I see when I do the same on my 2017 Civic. Her engine uses a cartridge and when I look in the drain pan while changing the oil on her car, I search I can see very tiny particles in the bottom. It's easiest to see them when it's sunny and I'm emptying the drain pan into a jug for recycling. Is this just the result of her car using a cartridge filter so the captured debris gets dumped into the drain pan, something you'd never see from a car that uses a canister filter?