Would you possibly also include the MicroGuard Select oil filter as well on your good list ?
Replacement for Purolator Boss Oil Filters
- Thread starter stangman700
- Start date
BrendanC
$100 site donor 2024
yes it’s the same filter as the carquest premium or premium guard Xl
Here’s the filters that fall under the PG portfolio.
https://bobistheoilguy.com/forums/threads/all-about-carquest-oil-filters.390750/post-7106685
- Joined
- May 29, 2024
- Messages
- 10
Thanks for the feedback. I have become highly skeptical of filter manufacturer claims, like the one Premium Guard is showing here for their Extended Life filters. 99% multi-pass efficiency and removal of particles as small as 25 microns does not mean their filters are 99% efficient at 25 microns during a multi-pass test per ISO-4548-12 testing. To me it simply means they have conducted the test per the ISO-4548-12 standard, that their Premium filters are 99% efficient at some particle size (they aren't saying), and their filter captures particles as small as 25 microns. Seems like 25 microns may be more of a nominal rating than a 99% capture, multi-pass test. This is how oil filter marketeers get us to believe their claims. But regardless of what you believe they are saying, PG doesn't offer an Extended Life filter option for my application. When I enter the Chevrolet applications that should produce results for a 13/16-16 thread filter, all I get is the regular PG filter, no EL options are offered. Plus for my supercharged application, the flow rating is a little low for what I need. I do appreciate all of the suggestions, and offering up the PG. I was not aware of this company before, and how many private label deals they have going.
- Joined
- May 29, 2024
- Messages
- 10
Unfortunately, they don't offer any Extended Life filters for my 13/16-16 thread (Chevrolet) application, just their regular filters.
- Joined
- May 29, 2024
- Messages
- 10
Thanks much! Yes, I recall seeing these graphs on BITOG site before, but I was a little skeptical since some of the graphs only show 4 results/color traces, while others do show all 5. Nevertheless, the Fram Ultra Synthetic looks to be a very solid choice. The BR testing showed similar high marks on filtering, however the differential pressure testing from Ascent seems to be at odds with the BR testing. The Ascent results show very good results, while the BR had hot diff pressure testing as towards the bottom of the pack. Maybe I missed something, however I didn't see anything in the Ascent results about how much flow they were subjecting the filters to during the diff press tests, while the BR tests were conducted at multiple diff press points to simulate low through high rpm performance. Have you seen any other press diff tests on the Fram Ultra Synthetic? Who/what to believe?? Yes, I thought BR did a good job at these tests too. I will re-read the Ascent Filtration Testing thread again.There has been a lot of water under the bridge about oil filters in this forum. There are theories why the BR testing should be taken with a grain of salt. For instance, the official spec sheet from Purolator/M+H shows the Boss to be 99% >46 microns, yet it shows as the best filter on BR's ranking. Doesn't correlate. The Boss also comes in relatively low in efficiency in this official ISO 4548-12 test conducted by "Ascent Filtration Testing", in an ISO 4845-12 certified lab. If you want to learn about official official testing of oil filters it might be worth your time to read this long thread.
Another theory that the Boss ranked high in BR's testing is because the filters with stamped leaf springs had internal leakage going on, as discussed in many threads. So those leaky filters therefore ranked lower then they should and their efficiency went down to the level of the Boss. Whatever is the cause or causes, the Boss looks to be the best filtering filter, but based on other official test efficiency info it shouldn't rank that high.
The only BR testing I reference is their dP vs flow tests which I feel is pretty accurate. It's hard to get dP vs flow info on filters. But the bottom line on dP vs flow testing is when you look at the whole group of filters compared to each other, their flow performance difference typically isn't enough to worry about on an engine with a PD oil pump.
I will get a video out with more details, but at the moment I cannot. I hope you all enjoy this summery of your favorite filters! You all have waited long enough and I appreciate you patients!
BrendanC
$100 site donor 2024
Some don't show up on some graphs because they are off the scale. Watch the scales on the graphs.
Here's the flow testing Ascent did .. don't recall which post number in that long thread, but this is and I've annotated it to show you can convert units to PSI and GPM. This was with hot test oil at 15 cSt I believe. You'd have to read lots of that long thread to get all the details on the ISO 4548-12 testing. This graph shows the dP vs flow, and if you look at say the 30 L/min mark (8 GPM) the avg dP of the group is about 160 in-H2O (4.5 PSI). The difference between them at 8 GPM is only around 35 in-H20 which is only 1.3 PSI.
So the bottom line is the dP vs flow of all these filters will not make any difference to the oiling system because it's being force fed by a PD oil pump. No engine will ever know the difference. If you look at BR's dP vs flow for the hot oil, the difference between the filters isn't much, and again means it doesn't matter much.
As far as efficiency, the best source for that is to reference ISO 4548-12 test data. It's been used in the filter industry around the entire world for over 25 years.
- Joined
- Sep 1, 2024
- Messages
- 725
Those Fram racing filters are pretty special. Didn’t realize they moved production to China. Has a fiber bypass gasket, designed before first brands.I wonder if there is a Fram factory in China. If so, who knows what’s next.
I noticed Ascent didn’t agree with Purolator Boss spec sheets. Interesting how expanding graphs along an axis visually influences. Well, Ascent does say for these filters only and no others. Doesn’t say these model number filters.
I noticed Ascent didn’t agree with Purolator Boss spec sheets. Interesting how expanding graphs along an axis visually influences. Well, Ascent does say for these filters only and no others. Doesn’t say these model number filters.
The Boss probably got worse since Ascent did his efficiency test, lol.
That's why it's good to look at the numbers on the graph axes.
But you never really know what filter you are going to get with PG. These 4 filters are all presumably PG, same filter application and 4 different filters. I have a 5th PG branded filter that looks close to the CQ one. BTW the STP filter stinks to high heavens.
I have a whole shelf full of boss and ones and will run every last one of them and not fret a bit. I also have a case of parts plus (not xl) that I’ll use for winter runs. My 18 saw nothing but the dreaded Bosch filters for 100k and still runs like a Rolex. As long as I don’t get dry starts (gohner Nissan) I’m satisfied.
