your oil filter preference

[JFP in PA]

Originally Posted by thstone

With the above being said ^^^, I understand that my experience is not representative of all engines.

However, in reality, doesn't the oil that goes thru the bypass get filtered the next time thru? Even if the bypass was permanent, isn't the turnover rate high enough such that it wouldn't take long for all of the oil (and all of the contaminants) to have passed thru the filter?

What I mean is first pass, 20% unfiltered. 2nd pass 20% of the first 20% is bypassed (0.04%). By the third pass, 20% x 20% x 20%, only 0.008% of the oil is unfiltered. Very quickly, the amount of unfiltered oil approaches zero and any new contaminants are also quickly filtered out in only a handful of turnovers.

Or am I missing something?

Problem remains that as long as there is any bypass, particulate matter is getting fed into the main oil galleries feeding the rods and mains; which is never a good thing.

[911monty]

Originally Posted by thstone

With the above being said ^^^, I understand that my experience is not representative of all engines.

However, in reality, doesn't the oil that goes thru the bypass get filtered the next time thru? Even if the bypass was permanent, isn't the turnover rate high enough such that it wouldn't take long for all of the oil (and all of the contaminants) to have passed thru the filter?

What I mean is first pass, 20% unfiltered. 2nd pass 20% of the first 20% is bypassed (0.04%). By the third pass, 20% x 20% x 20%, only 0.008% of the oil is unfiltered. Very quickly, the amount of unfiltered oil approaches zero and any new contaminants are also quickly filtered out in only a handful of turnovers.

Or am I missing something?

thstone I hope we could all have high mileage vehicles that simply wear out but most will probably never see those mileages. So trying to prevent the myriad of engine failure causes is probably more of a concern.

As far as eventual filtering is concerned as long as the filter bypass (excellent terminology) is open, oil is not being filtered. This is due to fluid flow(oil) will be to path of least resistance which is though the bypass and not the restriction of the media.
Once the bypass closes then your calculation is effected by the beta efficiency of the filter which for the WIX/NAPA filter is 95% of 20 micron and 50% of 2 micron particles on first pass. SO unless your engine never generates any debris there will always be material, especially in the <20 micron range.
While the greatest engine wear occurs on dry startup, some percentage of the remaining wear could be attributed to the abrasive wear caused by the <20 micron particles. If we can remove the metallic component from this debris maybe we can reduce the more abrasive component.
Lastly what caused the lifter failure of your engine? Plugging and stuck? If so then perhaps 50 % of your engine failures were due to circulating debris. Wore out lifter carrier! Anyway only the best for my car and if this helps then I won't have to have my daddy buy me another one! Win WIN!

[rick3000]

I installed the LN Spin on adapter today. I had just shy of 5k on a Napa/Wix 7211 paper filter. The one with the plastic sides and it did not disintegrate at all. But I did find some particles in the filter when I tore it open. However, none of the larger (circled) particles where magnetic/ferrous. I ran a magnet over the filter, and only pulled off a few tiny sand sized particles.

Looking forward to comparing this to the spin on filter with hard drive magnets in 5k miles.


Originally posted in: Manual Transmission Drain Plug - Magnet?

[911monty]

Promised I'd follow up when I changed my oil so here goes. Oil changed at 4000 miles, Castrol Edge 10w-40. These pics are from the inside the oil filter. The dark lines are from the ferrous dust removed by the filter mag. These are extremely fine particles. Unfortunately I was unable to capture the glitter effect from the particles. I'm happy spending a small amount of money to get this out of my oil. Cut open the filter and examined with magnifying glass and strong magnet. No ferrous particles. There were some plastic particles, some gold others dark green I removed and photographed. Sample of oil sent to Cat for analysis. If any interest I can post results of the UOA for comparison. Thanks

[Perfectlap]

^ the UOA would be an interesting before and after if there is an improvement.

[JayG]

You are supposed to change the oil filter?

[911monty]

Originally Posted by Perfectlap

^ the UOA would be an interesting before and after if there is an improvement.

Yes it would.. This is the second oil change since I started the using the Filtermag. But unfortunately this is the first UOA that I have had done. It should still be interesting to see the metal content.

[JayG]

Originally Posted by particlewave

OEM + magnets on the housing (DIY).

I may machine my own adapter in the engineering depatment this fall. The LN tax is too high for me to justify.

Group buy for the P-wave spin-on adapter?

[steved0x]

Originally Posted by particlewave

OEM + magnets on the housing (DIY).

I may machine my own adapter in the engineering depatment this fall. The LN tax is too high for me to justify.

If you do, see also about making one with an integrated port for an accusump that does not hang down as far as the LN Adapter + Canton Sandwich adapter (although that may not get you much since the LN adapter doesn't hang down all that much. ) But a combined unit should be able to save some height...

Steve