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6 months OCI ...leave the filter unchanged? #4113208 06/02/16 09:28 AM
Joined: Jun 2015
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asker123 Offline OP
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I heard that oil filters are more efficient when they are bit old( clogged) ...
Honda Accord 2003 4 cyl( oil burner ) I normally do between 6000 to 8000 KM in 6 months hence I only change oil and filter based upon the Honda prescribed 6 months OCI rather than kms...

I am running Mobil 1 oil with Mobil 1 M1-110 filter

Will I actually benefit from not changing the oil filter at 6 months OCI as by that time it only has approx 7000KM and will provide better efficiency for the next 6 motnhs rather than the new filter ?

or this little bit clogged filter is better theory is just a myth?

Cost is non issue to me ( Otherwise I would not run such an oil and filter combo on this car at the first place.. Car has 137000KMs.. drives like new)

Last edited by asker123; 06/02/16 09:29 AM.

Honda Accord 2003 4 cyl
Mobil1 EP 0W20, M1-110 oil filter
OEM engine air filter
Honda brand ATF-dw1, Type 2 Coolant , Brake Oil
Re: 6 months OCI ...leave the filter unchanged? [Re: asker123] #4113216 06/02/16 09:39 AM
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jk_636 Offline
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My vote is for always changing the filter when you change the oil. 2cents

Good luck!


2006 Dodge Ram 1500 4.7 (Supertech 5w30 + OCOD)

2012 Ford Escape 3.0 (Royal Purple 0w20 + Fram Ultra)
Re: 6 months OCI ...leave the filter unchanged? [Re: asker123] #4113239 06/02/16 10:07 AM
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HemiHawk Offline
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In theory they filter better when they have some dirt collected, but probably not enough to matter.

In your case though, if you wanted to, you could leave the filter for 2 OCIs. Sounds like the internals should be pretty clean from regular changes, and the M1 filters are touted to run 15,000 miles. So by distance you are OK.


2015 Mustang GT
2017 VW GTI sport
2001 Grand Cherokee
1995 Mustang GTS
Re: 6 months OCI ...leave the filter unchanged? [Re: asker123] #4113261 06/02/16 10:31 AM
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ARCOgraphite Offline
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My Nissan filters are too small to leave for one oCI smile


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: 6 months OCI ...leave the filter unchanged? [Re: asker123] #4113262 06/02/16 10:34 AM
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BrocLuno Offline
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The State of California Fleet Administration ran extensive testing a few decades ago and came to the conclusion the filters should stay for 2 OCI's and oil should be changed at 6,000 miles. They administer some 25,000+ vehicles, so that's a big enough test to validate their results (no one-offs).

There are also some technical papers derived from recent studies that say that oil makes AW compounds as it ages in an engine. Compounds that are unique to that engine, environment (outside air temps, etc), local fuel, and drivers habits like hard acceleration, or not. These compounds are very beneficial to engine life and better overall lubrication.

http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4049815/1/Diesel_Piston_Ring_and_Liner_W

The oil you are using can readily go 10,000 miles. You are changing it before then, so the the detergent levels are always high and so is the TBN. One way to counter part of this fresh oil is to leave the filter and it's contents and only change it after the second OCI so that there is always some residual "used" oil in the system.

I have moved to this scenario after doing the do diligence and reading the papers. Others are moving in this direction too.

If the car does not consume oil, does not have a mechanical failure, and does not darken the oil prematurely (like first week), it's safe to say the the filter is not catching much. It is certainly not "full" by the change interval.

The biggest concern for wear is Fe particles in the system. Add a magnetic drain plug and catch those there. the filter can go longer. So can the oil as long as it's that oil (good) or an equivalent.

I agree with getting in, under and around the car every 6 months as visual inspection is important. But modern oils are taking us away from the short changes we grew up with ... Follow the book, but don't do unnecessary work or become overly compulsive about clean. Then engine wants what it wants and as long as it's OK (running well) just do what's prudent ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: 6 months OCI ...leave the filter unchanged? [Re: asker123] #4113267 06/02/16 10:38 AM
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sir1900 Offline
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A $17 filter to be changed out after 8,000 kms is overkill. Leave it in for another 8-10,000 kms.

M1 is rated for 24,000 kms.


2015 Infiniti Q50
Mobil1 5W-30 + FRAM PH6607

2015 Nissan Murano
Mobil1 AFE 0W-20 + Mobil 1 M1-108A
Re: 6 months OCI ...leave the filter unchanged? [Re: asker123] #4113272 06/02/16 10:43 AM
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bigt61 Offline
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Leave the filter - unless you have a sludged motor, even cheap filters will go 20k miles....IMO.


92 Suburban 2500 7.4L 58k M1_0w40 5yr OCI
99 Olds Aurora 4.0L 91K M1_5w30 5yr OCI
13 Dodge Dart 2.0L 30k PP 0w20 OLM OCI
70 Camaro 5.7L 59k
Re: 6 months OCI ...leave the filter unchanged? [Re: asker123] #4113277 06/02/16 10:47 AM
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slacktide_bitog Offline
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One filter, one OCI!

Re: 6 months OCI ...leave the filter unchanged? [Re: asker123] #4113297 06/02/16 11:12 AM
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bubbatime Offline
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Your owners manual states you can change the filter every other does it not? My 2005 Accord said to change the oil every 10K miles and oil filter every 20K miles. Said so right in the manual.

If Honda thinks you can safely do it with a cheapy OEM filter, you can definitely do it with a premium filter.

I've been changing the filter every other on every car I own for the past 10 plus years and never a problem.


2019 Honda CRV 1.5T dealer bulk
2017 Chrysler Pacifica SuperTech synthetic 5W20
2013 Yamaha XT250 Valvoline motorcycle 10W40
2006 GMC Sierra SuperTech high mileage 5W30

Re: 6 months OCI ...leave the filter unchanged? [Re: asker123] #4113313 06/02/16 11:25 AM
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Xrs2zz Offline
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Leave it be. Get the full use of the filter.


2003 Toyota Matrix Xrs-207k Miles
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