Re: mercruiser 470 oil filter
All of the above filters have ADBV's and do not have by-pass valves, which is what your application calls for.<br /><br />You can tell if a filter has an ADBV by looking at the inlet holes (the circle of small holes). If it has a rubber type seal, that's the ADBV.<br /><br />I should have added the venerable AC Delco PF1218 to the list of larger format filters above.<br /><br />Don't use the AC Delco PF25 or PF35 as they do not have an ADBV. If you wanted to use an AC Delco and didn't have room for the PF1218, you could use the PF454, as it does have an ADBV. However, the PF454 is smaller than the standard Merc filter.<br /><br />After taking apart ~20 filters that fit the V6 remote and V8 Mercs and sending the media off to labs, personally I'm running a Hastings LF279 in my boat. It filters better than the standard Merc (smaller pores), it flows better because it has more media, your sump has more oil (~1/2 quart), and it appears to be built better -- with many physical specs being bigger/better. Like the filters listed in my first post, it has the same important characteristics -- ADBV, thread, gasket, etc as the Merc. After all of that it also happens to be 1/2 the price and it is more easily accessible to me.<br /><br />The GM applications are easier to match than others that have the by-pass valve in the filter. Since the Merc / GM blocks have the by-pass on the block, we don't have to worry about that in the filter -- and the specs for it being different.