I bought my car new in April of 2020 with <100 miles. I installed the Mishimoto Catch Can within the first week of ownership. I was too caught up in my other car and normal grind of life to check it regularly, but after a year of ownership and 9,600 miles, I pulled the catch can to check contents. I was super surprised at how much it caught, and obviously feel bad about my negligence so I'll be checking it every 6 months or sooner. All that oil and buildup would have gone through the manifold if it hadn't been dropped out, so clearly doing a good job.