Relevance of changing the oil filter every OCI
- Thread starter OM605
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I’ve done it but it was due to laziness or being cheap. I’d rather use a mediocre filter and change it more often than a high end and leave it longer. But both are acceptable
+1. I look at it this way, if there's a half quart of oil trapped in the engine, and another half quart in the filter, now you're leaving a quart of dirty oil behind, or more. For those who like to run oil 10K miles or more that oil can be pretty dirty, spent oil, no thanks. I better hide...........
All preference really. I do change oil without the filter, but never let the filter go past a year.
I guess the correct answer would be do a long drain oil with some analysis and change the filter after that.
I guess the correct answer would be do a long drain oil with some analysis and change the filter after that.
Maybe a good reason to use a smaller oil filter then. Less oil trapped in the filter. 
I’m tempted to break habit and start doing this. Filter used for two OCI’s. But changing the oil every 5k means the oil is hardly used up. Thus whatever oil is in the filter is… hardly used up, and quickly diluted.
I lop open my filters these days. Plan is, when I see a change, I’ll alter course.
I’m tempted to break habit and start doing this. Filter used for two OCI’s. But changing the oil every 5k means the oil is hardly used up. Thus whatever oil is in the filter is… hardly used up, and quickly diluted.
I lop open my filters these days. Plan is, when I see a change, I’ll alter course.
sometimes i change JUST the filter + NOT the oil on lo mile vehicles + bikes, + also use better more lasting REAL synthetic oils i them. my modified 2001 TT225Q is a summer car mostly + due to only 4.25 qts in the engine it gets Redlines above average REAL synthetic oil + i use Redlines REAL synthetics is ALL drivetrains as they are rarely changed unlike engine oils!!
Not sure about the sump size. If you mean capacity, it holds 7 quarts. On my Jeep Grand Cherokee, after I remove the oil filter, oil continues to drain out of the threaded nipple for over a minute. That would all remain in the engine if I didn't change the filter. Which by the way is a full size filter.
ATex7239 said above, "... I’d rather use a mediocre filter ...". BLASPHOMY Check that man's papers!
Personal note: My '76 Ford 300cid 6 must have held over a quart of oil in its upper gallery. If the oil was not fully hot that oil would "break free" 5 or more seconds after I removed the filter. Of course engine designs have evolved a tad since the Bicentennial.
Personal note: My '76 Ford 300cid 6 must have held over a quart of oil in its upper gallery. If the oil was not fully hot that oil would "break free" 5 or more seconds after I removed the filter. Of course engine designs have evolved a tad since the Bicentennial.
Lets say it all adds up to half a quart - if thats what it is 7% of a 7 quart sump.
There probably closer to a full quart left inside.
If it makes you feel better by all means do it.
Some guys throw away tires with 20% tread left, or change wipers out before they streak and toss batteries on a schedule vs when they go bad - nothing wrong at all with that.
Is there a measurable reason to toss the Oil filter that you can see on a UOA? - nope not that Ive seen or that anyone can show me in thousands of analysis. I'm totally open to data on this, but there is a reason honda has done it since the beginning of time.
Ive never found any notable material inside any auto or truck filter in the last 25 years that was maintained from the start and was mechanically sound. A cleanup job- sure every time, a car I dont know the history of - sure. My own stuff Ive had since new - Ill run 10-20K filters for multiple OCI's
Modern autos just dont put out much if any crud into the oil.
I cut every filter on every item every time and have since grandpas day.
High load deals like boats motorhomes, construction equipment - Ill change out every time
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What is the thought process behind this?
I stand corrected... I looked at it again and you are right....I was a little surprised that they would do that... I guess that Honda installes very good oil filters. Me I will do both at each oil change...
You got that right the 07 accord I traded in had 386000 on it and ran great...it was a 2.4 engine.... I wish the HRV had that one....The 1.8 does not have much power...
OP, using a quality filter for two intervals shouldn’t be a problem at all, especially given the car’s history. But what would make this an even easier decision is using an oil extractor to remove the sump oil through the dipstick tube. My understanding is this is MB’s current service procedure, but not sure it applies to your example.
I follow this routine with my Hondas. No crawling on the ground or oil splashing about. Heck, don’t even need to don your oil-changing clothes.
I follow this routine with my Hondas. No crawling on the ground or oil splashing about. Heck, don’t even need to don your oil-changing clothes.
Do what you feel is best. I feel a new filter at every change is cheap insurance.
I guess if I was so concerned with the cost of a $5 - $10 filter, I'd also use that marginal oil they sell at Dollar Tree. There's no argument that it reduces waste, but if it's the money you're trying to save, give up one luxury item (Starbucks, cigarettes, beer, etc.) per oci and change that nasty filter.
Agree on doing what you feel is best, everyman gets to maintain his house car yard and all things his way.
Its one of the few freedoms we have left.
Im a data driven vs feeling guy a majority of the time.
To quote a very smart mod here - (I wish Id have quoted it but i did not)
"never confuse cheap insurance with assured waste"
I keep reading that a filter is a quart size when it's really only ~0.2 quart. Usually, there is about 0.5 quart left in the head and oil galleys.
