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Old 08-06-2005, 05:35 AM   #1
theamcguy
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PF44 PF46 Oil Filter Info

I sent an e-mail to AC Delco requesting the differences between the PF44 & PF46 oil filters. Here is what they sent back

"We appreciate your e-mail Mr. Strobel regarding the PF44 and PF46 Oil
Filters. Both of these Filters have an Anti-drainback Valve. The PF44,
which is has been superseded by the PF46, has a micron rating of 20 to 30
microns. The PF46 has a 10 micron rating."

Looks like the spec for our cars after the initial oil change is a filter with a 10 micron rating. Also at the GTOAA convention John Sawruk, Pontiac engineer and Historian, mentioned that for 2005 the engine oil spec is a brand new (I just checked my owners manual and the spec GM4718M has been around at least 6 years as I have some old AMSOIL around with that spec referenced) and the only oil on the market right now that meets the spec is Mobil 1. That does not mean to say that Mobil 1 is the best, only that so far only Mobil has submitted to and met the specs as outlined by GM for the LS2. Other oils in the future may also meet the specs but for right now only Mobil 1 does. What this means and what John explained, is that GM can refuse an engine warranty claim if the oil in the crankcase does meet the new spec. This only applies to the LS2 not the 2004 LS1. Guys don't flame me I am only putting out the information that was relayed at the convention by a guy who works at Pontiac. He made a point of getting that information out, so it may be important. (again John made a point of stressing the new spec on the 2005s and that Mobil 1 was the only one that met it right now.) I am now confused as the spec GM4718M is an old spec and I would think most if not all synthetics by now would meet it. Best though to check the label.
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Last edited by theamcguy; 08-06-2005 at 11:11 AM.
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Old 08-06-2005, 06:41 AM   #2
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Thanks for the info! Good stuff!
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Old 08-06-2005, 06:46 AM   #3
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20-30 microns down to 10....is significant....doesnt the touted UPF44 filter down
to 8-10 microns? The PF44 couldnt have been that bad, could it? And does this
mean the $4 - PF46 is just as good as the $10 - UPF44?
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Old 08-09-2005, 04:08 PM   #4
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is there a upf46 yet?
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Old 08-10-2005, 05:43 AM   #5
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Hmmm...wonder what the PF-59 is rated at since there has been discussion about swapping the 46 for it because it is a bigger filter.
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Old 08-10-2005, 05:56 AM   #6
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Found PF-46 at Pep Boys, Found Mobil 1 5 w 30 @ Sam's 6 for $24.66
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Old 08-10-2005, 07:40 AM   #7
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Quote:
Originally Posted by theamcguy...
The PF44,
which is has been superseded by the PF46, has a micron rating of 20 to 30
microns.

Funny thing, I used the same exact terminology (Superceeded) in one of the last 44 vs. 46 threads and someone didn't understand what I meant by it!
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Old 08-10-2005, 07:51 AM   #8
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Hmmm.. So what Filter should we be using now?? UPF-59??
Anyways.. How good are the Purolator Micronic's?? that's what I have been using.
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Old 08-10-2005, 08:39 AM   #9
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You should be using 46's. 59's are a longer substitute.
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Old 08-10-2005, 08:50 AM   #10
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Quote:
Originally Posted by CMNTMXR57...
You should be using 46's. 59's are a longer substitute.

I know it has been discussed before but what is better the 46's or the 59's.

or a purolator micronic?
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Old 08-10-2005, 09:09 AM   #11
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Some people want the 59 for the "added filtration". I personally disagree. But that argument has been pursued for quite some time.

GM does a lot of things cheap or a compromise, but one thing they don't is oil filters. If they did, they'd be out of business from all the oil related engine failures that would occur from poor oil filters. If the engineers felt the 46 (or even the 44 prior to) wasn' sufficient for the engines' needs and the 59 was, they'd have installed a 59, and recontoured the skidplate some to make it's additional length work. But that isn't the case.

I put only AC Delco oil filters on mine (heck, I just finished my batch of 44's, so now I'm onto 46's). I wouldn't put a Purolator filter on my neighbors lawn mower.
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Old 08-10-2005, 09:15 AM   #12
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Quote:
Originally Posted by redgtocruiser...
I know it has been discussed before but what is better the 46's or the 59's.

or a purolator micronic?

I have been using the 59, but on my last oil change I found a ding and scraping on the bottom of the filter where the filter had been hitting the skid plate. I will be switching to the 46 for the future.
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Old 08-10-2005, 11:13 AM   #13
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Quote:
Originally Posted by CMNTMXR57...
Some people want the 59 for the "added filtration". I personally disagree. But that argument has been pursued for quite some time.

GM does a lot of things cheap or a compromise, but one thing they don't is oil filters. If they did, they'd be out of business from all the oil related engine failures that would occur from poor oil filters. If the engineers felt the 46 (or even the 44 prior to) wasn' sufficient for the engines' needs and the 59 was, they'd have installed a 59, and recontoured the skidplate some to make it's additional length work. But that isn't the case.

I put only AC Delco oil filters on mine (heck, I just finished my batch of 44's, so now I'm onto 46's). I wouldn't put a Purolator filter on my neighbors lawn mower.

Hmm Purolator's that bad?? Even the micronic ones?? What other filters would you reccomend besides the AC Delco ones (which I have no problem using)

For example I have a 99 Ford Explorer, what do you think of the motorcraft filters?

Thanks for the filter info
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Old 08-10-2005, 11:15 AM   #14
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I don't think they're bad, but I prefer OEM parts.

Many people here like them.

Mobil 1 makes a nice one too, but it's costly. So if you're gonna change it every 3k, it's not worth the cost.
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