wouldnt say its filling it but most people ive spoke to tell me my catch tank wont fill up very fast however its already got like 2cms in it which seems pretty fast saying that ive done around 500? miles since service and its only lost mabye a quater of my overflow bottle and oil still seems perfect so am unsure if its just been the snow/weather somehow effecting the catch can also worth noting it had an engine flush done to it dunno if that would effect amout of shit in catch can