filter life
- Thread starter lewk
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I believe that the filter definitely should be replaced every oil change. Unless I run an extra short OCI for some reason, my filter's elements seem pretty dirty by the end of the OCI, which is in the 3000 to 5000 mile range. I observe the media held up to a light and on some could not see light through it. Other times there may be about 50 percent of the media area showing light. Since I have no good way of knowing just how clogged or used up the filter is (does not seeing light through the media actually mean it is clogged?), I find it is best to change. When in doubt, change it out.
I think Honda still recomends this. I did it for years on work trucks with no problems. I even did it on my wifes car once.
I did this recently on my wife's Expedition. I ran a Valvoline Maxlife VF2 oil filter for 5350 miles - 2300 miles on Maxlife oil, then drained that oil & put in QS 5w30 for another 3050 miles. I still have the filter, & plan on cutting it open soon. I'll post pics.
In fact, I've got 5 or 6 filters, from different vehicles, that I need to cut open & post pics of.
In fact, I've got 5 or 6 filters, from different vehicles, that I need to cut open & post pics of.
mobil 1, bosch premium, pure one, all good filters for the money with excellent filtering media. 7500-10000 miles on the filter with a few oil only changes cant be any more harmful than a 3k mile oil/filter change.NEW oil is filtered to roughly 40 microns. a new oil filter has to ramp up to this level to be efficient as opposed to the used in service filter.only an uoa with a particle count could expose the truth.
I think it is fine to only replace the filter every other change. Although there have been very few tests on BITOG, the few I have heard about showed that the pressure drop on a used (single oil change) filter was still far lower than the bypass pressure.
In theory, the older filter reaches peak filtering efficiency when it is really clogged up... just below the point where the bypass has to open due to excessive pressure drop.
I'll bet you could go three oil changes on a decent quality filter if you needed to... I probably wouldn't go more than two myself.
That said, I have personally always changed the filter with the oil. I'm getting dirty anyway and it's only a few bucks more.
I'm planning on running an oversized filter soon, though... and I'm positive I could run that two oil changes easily. Sad thing is the half quart of dirty oil that will remain in it.
In theory, the older filter reaches peak filtering efficiency when it is really clogged up... just below the point where the bypass has to open due to excessive pressure drop.
I'll bet you could go three oil changes on a decent quality filter if you needed to... I probably wouldn't go more than two myself.
That said, I have personally always changed the filter with the oil. I'm getting dirty anyway and it's only a few bucks more.
I'm planning on running an oversized filter soon, though... and I'm positive I could run that two oil changes easily. Sad thing is the half quart of dirty oil that will remain in it.
Would you pour a bit of used oil in with your fresh oil when you drain the engine?
That's what you're doing keeping the old filter on...
Besides not knowing the condition of the filter element itself and the anti-drain ( if it has one).
That's what you're doing keeping the old filter on...
Besides not knowing the condition of the filter element itself and the anti-drain ( if it has one).
It's like changing the diaper without wiping the kid's arse.
They could put a drain on the filter, but that would be just as big a pain as changing the filter.
The dirty oil left in the filter is the only problem with keeping the old filter installed if you trust the filter is fine.
Is that amount significant? There is also dirty oil in the engine passages that doesn't come out.
With the savings on the filter, theoretically I could put the money into changing the oil a little more often so that the "dirty oil" isn't quite as dirty. And, besides, that "dirty oil" is the same dirty as it was before I changed the oil (at 100% dirty concentration); if it is so horrible, I should have changed it sooner.
I wonder which method is best for cost/benefit? I'm not going to try to think about it, but anybody else is welcome to consider it. It's probably close to a wash. If you have one of those cars where the filter is difficult to access, that may be where keeping the filter for 2 oil changes comes out ahead.
The dirty oil left in the filter is the only problem with keeping the old filter installed if you trust the filter is fine.
Is that amount significant? There is also dirty oil in the engine passages that doesn't come out.
With the savings on the filter, theoretically I could put the money into changing the oil a little more often so that the "dirty oil" isn't quite as dirty. And, besides, that "dirty oil" is the same dirty as it was before I changed the oil (at 100% dirty concentration); if it is so horrible, I should have changed it sooner.
I wonder which method is best for cost/benefit? I'm not going to try to think about it, but anybody else is welcome to consider it. It's probably close to a wash. If you have one of those cars where the filter is difficult to access, that may be where keeping the filter for 2 oil changes comes out ahead.
no scientific study has examined the question. probably iffy lube conned everyone into the change every time thing.
as far as the dirty oil argument well maybe after you drain your oil you shouldclean the engine internals b4 ading nu oil
as far as the dirty oil argument well maybe after you drain your oil you shouldclean the engine internals b4 ading nu oil
The cost of quality oil and filters compared to the cost of a car is tiny. Cannot see why one would not want to use a new filter every time.
While not identical, when changing oil in some marine engines many people pump the oil through the dipstick, but that leaves maybe 1/2 QT of old oil. So some (me included) install oil drain hoses so we can pump oil out of the drain plug through the oil drain hose which gets everything just as if you unscrewed the drain plug and let the oil drain.
While not identical, when changing oil in some marine engines many people pump the oil through the dipstick, but that leaves maybe 1/2 QT of old oil. So some (me included) install oil drain hoses so we can pump oil out of the drain plug through the oil drain hose which gets everything just as if you unscrewed the drain plug and let the oil drain.
thanks for the responses.this is what I have decided to do: oil changes every 5k and filter changes every 7500. this will equate to a oil/filter change at 15k mile intervals.i have used amsoil sdf filters using this sequence with no known anamolies, i.e. can not be confirmed in the absence of a uoa. had the filter used been a non gm product I would NOT attempt this procedure.
Seems like you are making extra work for yourself (doing two procedures every 7500 miles), but that should be fine if you've got the time.
The cost of quality oil and filters compared to the cost of a car is tiny. Cannot see why one would not want to use a new filter every time.
If you are lazy like me, I do 15K oil filter changes, but I change the oil every 5K miles with the cheapest oil I can find for my wife's Honda
If you are lazy like me, I do 15K oil filter changes, but I change the oil every 5K miles with the cheapest oil I can find for my wife's Honda
LT4.."wifes" Honda....bet the Vette doesn't get the same treatment....lol
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