S2000 Under The Hood S2000 Technical and Mechanical discussions.

WARNING! OEM PCX-306 Filter

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Old Aug 11, 2025 | 04:19 PM
  #11  
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Originally Posted by Unbr3akable
Inspected all three of mine (just purchased from Majestic) and they are okay.

Will continue to inspect going forward; thanks for bringing to our attention!
Good to hear! I just ordered a few more from my dealer a few days ago but havent picked them up yet. They used to keep them on the shelf but recently told me that I was the only person buying them. I hope that I just had a bad batch? My only problem with this scenario is that I had purchased 2 of them together and 9 months later bought 3 more. I suppose its possible that they were from the same run. I will continue to check the filters closely as I always have. If this problem happened once, then it will happen again.
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Old Aug 11, 2025 | 04:28 PM
  #12  
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Originally Posted by windhund116
Thanks for this post. This is disconcerting, for sure. I guess that I'd better look for the older "004's" to stockpile.
I have tried that. Do not waste your time nor money from any seller on ebay or amazon selling the “004” filter. I bought a case from an amazon seller and was told that they were indeed 004 filters but when I received them they were the 306 filter with a sticker over the label that had the 004 part # on it. I did get my money back but its not worth the trouble as Im positive all of the old inventory of 004 filters has dried up. I dont blame the seller as they probably had this label on there as it was a superseded part number and to state it was the “same” filter as 306.

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Old Aug 11, 2025 | 05:15 PM
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Originally Posted by S2k1185
I have tried that. Do not waste your time nor money from any seller on ebay or amazon selling the “004” filter. I bought a case from an amazon seller and was told that they were indeed 004 filters but when I received them they were the 306 filter with a sticker over the label that had the 004 part # on it..
UGH! Prolly the real "004" are going to go for NOS prices, now. I have a few left.


"306" on the left and "004" on the right.

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Old Aug 12, 2025 | 03:26 AM
  #14  
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I still have several 004s. I going to check and see if I can still get more of them!
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Old Aug 12, 2025 | 03:35 AM
  #15  
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@S2k1185 Thanks for posting this!

Any variations in the packaging markings or marks on the filters such as dates, lot numbers or other codes, and country of origin?

Would be nice to have that information before I start pulling the plastic off them at the Honda parts counter. I don't have one in stock (just checked). Not sure what other cars use this filter nor where they are made. Any European sources?

I've been installing oil filters by faith all these years...

-- Chuck
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Old Aug 12, 2025 | 04:14 AM
  #16  
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I wonder if Billman has run across any of these issues. I expect not, as he hasn't posted a warning on here.
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Old Aug 12, 2025 | 04:36 AM
  #17  
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Wow, thx for investigating and posting.

Were these pieces completely loose and rattling free, or were they partially welded to the spots they landed on?

How much effort to free them?

I'm wondering about an idea of creating diy oil filter filter.

A rig that would run oil through filter before you use it. Side benefit, prefills filter for you.

A cheap oil transfer pump. A cheap generic oil filter relocation kit and a filter that fits it. A Honda specific oil filter relocation kit that our filter would fit. Some sort of cheap oil reservoir.

Guessing about $150 total.

Pump pumps oil through our new filter to clean it. That oil is then pumped into generic filter to filter the junk. That oil keeps looping through our filter then to generic filter, for as long as you want to make sure its clean.

The generic filter probably would never need to be changed. The oil would probably never need to be changed (until it ages out?) It'd never get dirty enough.

Get a generic Honda filter to spin on for storage, so its a sealed system.

To use, remove storage filter, install new S filter, turn on pump. Remove filter, replace storage filter. New filter now clean and filled.

Parts list:

Pump

WARNING! OEM PCX-306 Filter-screenshot_20250812_095513_chrome.jpg

Generic filter housing Generic filter housing

WARNING! OEM PCX-306 Filter-screenshot_20250812_094503_amazon-shopping.jpg

Honda filter housing

The above link doesn't show it, but its two piece, like this, on left is only piece we'd use:
WARNING! OEM PCX-306 Filter-image.png

Oil reservoir

WARNING! OEM PCX-306 Filter-screenshot_20250812_094618_chrome.jpg

Last edited by Car Analogy; Aug 12, 2025 at 06:03 AM.
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Old Aug 12, 2025 | 05:03 AM
  #18  
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Holy crap! I will be inspecting them intensely going forward.
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Old Aug 12, 2025 | 05:18 AM
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The two photos show the spalling at the same weld indicating a probability of the same machine and manufacturing batch. Hence my curiosity about lot numbers, dates, and manufacturing sites.

-- Chuck
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Old Aug 12, 2025 | 05:35 AM
  #20  
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For anyone viewing this, it is in all of our best interest to share this info with the Honda dealers we buy our parts from. Then demand they push this up the corporate Honda tree.

I'm not sure but is this section the unfiltered side of the filter?
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