For years I changed my own oil and never had a problem with oil filters leaking. I always use Penzoil oil and Fram filters. I also had Toyota dealers change oil when I was there for service. My current vehicle is a 1990 Toyota 4WD pickup with the 3VZE F6 engine. I'v had it since it was new.
Then I decided oil changes were too much of a bother so I had it done at the service station I frequent and at a local (not so) quick change place. Seems like every time then I had a leak from the oil filter which I corrected by tightening the filter. I blamed the competency of the latter places.
Then Tuesday I changed my oil. Old filter was on very tight but it came off intact. Installed a new Fram (I've always used Fram), checked it and seem fine. I hand tightened it and then use my filter wrench to turn it about another half turn until it seemed tight enough.
Then after parking overnight I had a small leak. I was busy so couldn't deal with the leak immediately. Then the next night, no leak even though I had done nothing. After second night I again had a small leak so I tightened the filter more. This morning, no leak.
So I'm puzzled. Did I initially over tighten the filter so it didn't properly seat? Or not tight enough? Or what?