The normal bypass element is just a perforated tin can stuffed with shredded rag......the element is changed when the oil starts to appear dirty......Normally ,there is a restrictor in the take off fitting in the oil gallery to limit flow to the elements......Once upon a time ,cars and trucks had nothing but bypass elements ,because owners couldnt be trusted to change oil and filters ,and a full flow filter blocking would affect the engine,a bypass blocking is hardly noticeable.......many moons ago ,I borrowed an uncles 47 Ford pickup which had never had detergent oil ,nor even an oilchange .....just topped up.......Anyhoo ,I used my employers detergent diesel oil in it ,and it started to smoke so bad ,I had to hone the bores and fit new rings to stop the smoke.