I had this in the mechinac/repair forum but did'nt get any where with it. What do ya think?? My brother in law has a newer, b/s 20 hp OHV I/C, it does not have a filter on it, but looks like there is a place you could unscrew a cap to where a filter might go. Can I unscrew it an just put on a filter, also located by it looks to be a sending unit probably low oil. what do u think do it or not??