Exactly. But I think what @partspro was getting at is the longer you push a filter, the more likely it will reach the "used too long" phase, and you wouldn't know it went into bypass mode if it had. (correct me if I'm wrong, I'm not aware of any early warning system that let's you know when this happens.)
Look at the gasket on a filter that's been on the engine for quite a while compared to a new gasket. The used filter's gasket will be permanently compressed by quite a bit, so there is no more "spring" in the gasket, which could potentially cause sealing issues if removed and reinstalled.That's why you oil the gasket before installing.
^^^^ This ^^^^
Never had that problem. Maybe on a 10 year old filter where the rubber has turned to hard plastic, but not one that's a few years old. You just tighten it a quarter turn more.
Never may not last forever. It's simply not worth removing an oil filter to try and drain the oil out of it to then re-use it. Leaving 8~12 oz of oil in an oiling system that takes 5-8 qts of oil isn't going to hurt anything, especially if the oil is changed at a normal interval.
No to both. That would be total waste of time especially at rate my 2AZ-FE engine Camry uses oil
Yep, either continue to use it or replace it. The middle ground of trying to get every last drop out of the engine is an exercise in futility. Even when draining the oil and replacing the filter, there's often a fair amount of old oil left in the system. Ex: my oil filter holds .4 (4/10) quart but the engine retains 1.4 quarts when doing a complete change with the filter. YMMV, but you get the picture, I'm sure.
Well kschachn, we can’t reach everyone.
Also the oil left behind in the filter and galleries at 5,000 miles still has more life in it than some who are running 10,000 mile OCI's. Its just not a problem and I can avoid crawling underneath the car to get the filter that day. Its always just easier to drain the oil and put the plug back in.
On all three of my cars, I have to crawl under the car to drain the oil anyway. But I'm definitely considering leaving the filter on for two OCIs for all of them. Funny, all three of my cars (Infiniti M45, Honda CR-V, Honda Civic) use the same 7317 filter. Apologies to those who have posted that this question has been asked frequently before. But the fact that there have been nearly 3 pages of posts means it's still a relevant question to ask.
Yes exactly. Just because the oil is used long enough that the owner or manufacturer says to change it, this does not mean the oil is suddenly bad. It is still lubricating the engine, more than likely it still has some TBN and useful additives, and the little oil left behind will not "contaminate" the new oil. There is always a safety margin built in unless you have gone far, far beyond a reasonable interval, which is another topic.
