Where? From the under valve cover pics often posted here, maybe a few tablespoons of oil there.
Fill with new oil before installing.
Can I use an oil filter twice
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Depends on the quality of the product used.
Used to think that too, but there is a "rebuild / fill from empty spec" and a oil change spec. I looked in my FSM and my VQ40 holds almost an extra quart. I didn't know either. I assume in the oil galleries and such. It makes sense - if you pull apart a drained engine it drips forever: https://bobistheoilguy.com/forums/t...il-pennzoil-platinum-5w30.384412/post-6931270
Depends on the orientation of the filter. Yes, if you can. Some you can a small amount, some not so much. Also, the oil galleries are empty as soon as you release the ADBV - so at that point filling the filter is an illusion of benefit mostly.
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I bought a new 2008 Suzuki DL 1000 and the manual called for a filter change every 3rd oil change. 
At the time I was shocked to see a manufacturer recommending this crazy interval, and after I had ordered a case (12) of oil filters. Well, I got to thinking…..maybe the people at Suzuki might know a bit more about oil, lubrication, engine design etc than I do. So I decided to start changing oil filters at every other OCI. The bike ran like new when I sold it and I sold the left over filters. My ‘infamous’ 2005 Chevy Avalanche had 248,000 miles on the odometer when I sold it last month and used no oil at 5,000 mile OCI’s and oil filters replaced at every other OCI. IIRC at one time Honda recommended filter changes at every other OCI.
At the time I was shocked to see a manufacturer recommending this crazy interval, and after I had ordered a case (12) of oil filters. Well, I got to thinking…..maybe the people at Suzuki might know a bit more about oil, lubrication, engine design etc than I do. So I decided to start changing oil filters at every other OCI. The bike ran like new when I sold it and I sold the left over filters. My ‘infamous’ 2005 Chevy Avalanche had 248,000 miles on the odometer when I sold it last month and used no oil at 5,000 mile OCI’s and oil filters replaced at every other OCI. IIRC at one time Honda recommended filter changes at every other OCI.In my opinion that's the thing you should not do.
I've used the oil filter for 2 changes (as recommended by Honda) since I bought the vehicle. But I wouldn't consider taking the filter off and emptying it. That just introduces an opportunity to get dirt in the filter, and more importantly to lose the seal. You never get all the oil out of an engine and the small additional amount in the filter is not consequential.
Actually you're pouring dirty oil out. And the op is using a 25k mi filter. If the seal can't handle being re-tightened after just 3-4K mi, it's a junk filter to begin with and should be changed anyway.
+1
Don't remove the oil filter unless you plan on replacing it, as re-using it risks compromising the sealing gasket. Also, there is not much old oil left in the filter that will "contaminate" the new oil. Probably about the same amount leftover in the engine from draining.
No.
The filter is meant for 25k mile continuous use, not unscrewed and screwed back on every 4,000 miles.
I don't do it but Honda - they know a thing or two about engines - has been saying use the filter for 2 oil changes for decades. It's not a new revelation from them. If they say it's okay, I believe them. I just choose to replace the filter since they're cheap and I'm already under the car. I don't even think dealers leave the filter on for 2 changes as they'd get reamed over this, even when Honda says they can. If their work order says they "Performed Honda A1 service", they would be in the right, but I'd guess most say "Oil and filter service".
I'm just not built that way. If I'm under the car anyway, filter is getting changed. YMMV.
I don't change oil as often as most people here and I run a filter longer than most, often for two OCIs. Been doing this for 40 years. My cars run fine.
My 2016 Hyundai is a different story.
My 2016 Hyundai is a different story.
Changing the air filter early has more of a longevity effect on an engine than an oil filter every 25k. Inhaling grit etc wears an engine quickly. If oil changes are on a respectable routine with today’s oils and engines, I wouldn’t be surprised if someone tried running without ever changing an oil filter. I’d bet most would make it to the trade in and/or sale of the car. Just another opinion. I change my oil filter every change 6k.
This whole thing about "the manufacturer knows best" is basically pure garbage. And it means nothing in regards to their supposed "knowledge".
They "know a thing or two", about getting the engine to the end of it's warranty, without any major failures. Because that's all they're financially liable for. It's much the same when they all start pushing these "lifetime" transmission fluids, 0W-16 oils, or 10 year, 100,000 mile coolant changes.
All of those claims will most likely hold true, as long as they're liable for any failures. So why not call for extended oil and filter change intervals? It's appealing to most people, because most don't like doing maintenance, or spending the time and money on it. So less is more..... For a while anyway.
But after that, when you're on your own, you've done yourself zero favors by adhering to them. Because you're on the hook afterward, not them.
If you lease, or trade in as soon as you're not underwater on your loan, you'll be OK. But if you plan on keeping your vehicle long term, you're better off operating it on a far more frequent maintenance protocol.
How many cases of that do you know of ? Engines aren't magically failing "on schedule".
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My 2007 BMW is an example. It came with free maintenance for 4 years.
At the beginning, you can have a free oil change once a year. Including low mileage cars.
Then, the policy was changed so that anyone who didn’t drive 6,000 miles, no free oil change. When people said this makes no sense thought it was a year regardless of mileage, BMW went back. 1 free per year.
Then, they changed the interval to 2 yr 15,000.
Keep in mind this is the same car and same oil, yet everything was changing around it. Why? Because maintenance is free.
Now take Lexus where it wasn’t free. Suddenly a car needs an oil change every 6 mos or 5k.
The mfg has an agenda imho…
Both the manufacturer and the government. The agenda is CAFE. They're in bed together on this whole deal. You basically have to be the husband that walks in and catches them.
Hermann
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After a change there is more old oil laying around in the upper parts of the engine than what is in the filter. If it is a small filter even less of a worry. Use that filter twice if you want. OTOH if I'm crawling under the engine to let the oil out of the engine and out of the filter, IMO you might as well change it.
They're not, "magically failing". But the odds are in favor for a better maintained engine to last longer, than one that isn't. Auto repair shops are full of proof.
You can smoke for decades and not necessarily die from it. But what have you gained by taking the chance? Why take a risk on pushing a longer maintenance schedule, when the actual reward for doing it isn't there?... If there even is one.
The best oil filters clean out 20um. 20um is basically 1000 grit sandpaper. They take out some portion of 10um (1800 grit sandpaper).
I polish my headlights with 3000 or 4000 grit sandpaper.
So even the best filters are not great. I think the oil filter is sort of a skim the worst out affair.
Best oil filter is more frequent oil changes. Dump all the smaller particles in the drain pan. IMHO.
I do not run multiple oil changes because I am more afraid of an oil filter failure than either its micron rating or it getting full.
I polish my headlights with 3000 or 4000 grit sandpaper.
So even the best filters are not great. I think the oil filter is sort of a skim the worst out affair.
Best oil filter is more frequent oil changes. Dump all the smaller particles in the drain pan. IMHO.
I do not run multiple oil changes because I am more afraid of an oil filter failure than either its micron rating or it getting full.
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