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What constitutes a used up bypass oil filter #5219509 09/22/19 07:27 AM
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Donald Offline OP
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If I ran an Amsoil bypass oil filter until the outside of the can no longer got hot meaning no oil was flowing through, then pulled it from service and cut it apart, what would it look like? An inch of black crud on the filter media. Or just clogged filter media that is difficult to detect visually.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: What constitutes a used up bypass oil filter [Re: Donald] #5219693 09/22/19 11:48 AM
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Depends on the condition of your engine I'd think. Since you're on this site, I'd wager you might see some discoloration, but no sludge. laugh


"Let’s not pretend like 0w20 is anything but a CAFE required crutch to eek another 1/2MPG" - BLND1

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Re: What constitutes a used up bypass oil filter [Re: JLTD] #5219699 09/22/19 11:54 AM
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Donald Offline OP
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Diesel engine if that makes a difference. Does a bypass filter soot? I assume not.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: What constitutes a used up bypass oil filter [Re: Donald] #5219813 09/22/19 02:37 PM
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46Harry Offline
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I've been using the temperature of the by pass filter for the time to replace the filter. This is what I learned from old time mechanics that worked on engines that only had a by pass oil filter. It has worked for me for more years than I care to remember

Re: What constitutes a used up bypass oil filter [Re: Donald] #5219847 09/22/19 03:27 PM
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4WD Online Confused
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Do you have pressure and/or temp sensors at the mount?

Re: What constitutes a used up bypass oil filter [Re: Donald] #5220188 09/23/19 05:20 AM
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Donald - are you just asking because you're curious? Or do you have an application actually in use?

If you run the BP element until the flow is low enough that the canister is cool to the touch, they the BP is essentially blinded off and not flowing anything to speak of. (likely flowing some, but not enough to make a tangible difference).

The BP element will catch pretty much any particle that is about 2-3um or larger, so yes, it will catch soot once the soot gets that large. (Soot starts out WAY smaller, so it takes a fairly long OCI to get to that state).

Last edited by dnewton3; 09/23/19 05:21 AM.

The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: What constitutes a used up bypass oil filter [Re: dnewton3] #5227260 10/01/19 07:33 AM
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Originally Posted by dnewton3

The BP element will catch pretty much any particle that is about 2-3um or larger, so yes, it will catch soot once the soot gets that large. (Soot starts out WAY smaller, so it takes a fairly long OCI to get to that state).


I would say 99.999% of all diesel engine oil soot is smaller than 1 micron and won't be trapped by the bypass filter.
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However, I seen multiple reports where a bypass filter makes big changes in particle count reductions. So that is something.

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"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
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