OIL IN THE INTAKE PIPES, i'd rather pay $30 and know i dont have to rip of my front bar, take off most the pipes and clean them out, in case i did get blow-by
they cant say much, one with a small filter on top of it is a mod to engine emissions but ones without it are fine and nothings vented to atmosphere
my car did blow oil throught the intake coz the f**kwit i bought it off put 3.8lt's of oil extra when he serviced it. My mechanic (brother) told me this was the problem and that it wasnt blow-by, once he serviced it, the oil neva went thru again, nor did my can eva fill up
put it this way, if u get a can and u know no oils going in there its all good, wen u do get oil u mite b in trouble, least the can saves you from more cleaning worries