No more Pure Ones for me!

[another Todd]

It's Napa Golds from now on. Well OK, if they change their bypass design I might go back. I have wondered for about 25 years why the bypass was at the end of the filter and not the beginning to prevent previously filtered crud from being reintroduced back into the circulating oil. Wix has put the bypass at the thread end to prevent that. GMs also prevent that with the bypass built into the block. I asked Purolator about their design and their reply was just that "filter wash" in bypass mode doesn't happen. Napa golds from now on.

 

[TallPaul]

I am using NAPA except for one Purolator I have left, which happens to be a L40017--the only Purolator with a threaded end bypass I have ever seen.

 

[Gary Allan]

I just don't see it happening that often ..nor do I think that the wash effect is anything to be concerned about. It's not like there's a "rush" around the media. The pressure is equal on the media and the opening of the bypass.

But, admittedly, for those that are concerned about it ..there is no dome end bypass that will eliminate it. The only solution is a filter without it

 

[Ray H]

A difference with little real distinction as far as I'm concerned. A> unfiltered oil is going back into the engine regardless of bypass location, and B> there isn't anything preventing previously trapped particulates from joining the happy frenzy going back into the "general population" during bypass. (You really don't believe there're eddy currents over the length of the filter washing trapped particulates off their comfy media "bed" and directing them through the bypass channel regardless of its location? Really?)

 

[Shannow]

When the bypass is open, there is STILL positive flow of oil through the media, i.e. in the direction that maintains the particles in the media.

 

[T-Keith]

I'm also not sure how much of a problem this really is. From what I've seen the bypass doesn't open all that often, and even when it does oil is still flowing through the media. The only way stuff would be able to get back up would be if the flow reversed.

-T

 

[another Todd]

Like if the anti drainback valve (is that the right term?) leaked. Then oil could drain out of the oil galleys backwards through the filter upon shut down. Next morning you go immediately to bypass and what do you know, backflushed crud into the engine. I agree it probably is a very small amount of contaminant reintroduced this way, but if it can be avoided with just a brand swap, why not?

 

[Gary Allan]

That's what your ADBV is there to prevent, rapid back flushing. It's not required to keep the filter full. There's a time component to how long it must hold. I've never personally heard anyone say that they've heard startup rattle on every start. It's usually the first start of the day ..or maybe if it's sat for more than a few hours. That's more then enough time to only drip oil in backflow.

but that's not going to change how you feel about dome end bypass valves...so Wix it is.

 

[TallPaul]

Interesting point Gary. I get startup rattle mainly on the first start of the day. I think I need one of those filter dangler adapters you once recommended for my horizontal mount 4.9L I6.

 

[Gary Allan]

Yes, if the ADBV was all that important for startup oil pressure, every engine manufacturer on the planet would have a big sticker under the hood stating: FRAM WILL VOID YOUR WARRANTY - DO NOT USE

The right angle adapter is available NEW at any local MOPAR part counter. Just ask for a right angle adapter for a 2000 Cherokee w/4.0. It's about $45 with all the fixins. Older ones had a hex bolt ..but now they use Torx for the hollow bolt. You retain your removed 3/4-16 thread stubby to fit in the end of the right angle mount.

 

[FleetFilter.com]

Try us for your NG/WIX filter need. We are the cheapest around.
Bryan