We've had rigs in here that have that small bit of seeping around the o-ring and they will typically go a couple to several years before it gets bad enough to be a problem. The seeping stops when the radiator warms up and only seeps when they are cool. I've never seen one catastrophically fail due to that issue.OEM isn't always the best! My OEM radiator had a very small leak. So small it wouldn't even drip, but I could smell it! So I brought my Jeep to a radiator guy, (not a mechanic or an auto parts store) a guy who repairs radiators. He told me my leak was a common one for these radiators. The leak was coming from the gasket between the plastic bowls and the aluminum core. Very common and was really not worth fixing. I could buy a new OEM radiator for the same price or less. But warned me that the same thing WILL happen again sooner or later. He told me that if I didn't want to deal with this problem again that I should buy an all welded all aluminum radiator from Northern Radiator.
https://www.northernfactory.com/
Yes it was more expensive but we'll worth it. It has twice the cooling capacity, equal to a 4 core radiator. Now I've never had a problem with the OEM keeping my engine cool, but I'm not going to turn down extra cooling capacity. I installed this a couple of years ago and have had no problems. I also installed a bug screen behind the grill to help protect the radiator. The reason he was promoting Northern was that some all aluminum radiator companies will use rubber, plastic, ect. To seal the bowls to the core that will crack over time from heat and leak. but Northern uses aluminum to seal theirs. They can take a lot more abuse. This is the same kind of radiators that are used on off road equipment like front end loaders.
I'd consider a Northern but they are on the Wizard cooling site and I wouldn't run one of their products if you gave it to me for free.
A bit of clarification on your 4 core statement. A radiator has one core. The core consists of a row of 1 or more tubes and fins. Assuming that you were meaning 4 row, that doesn't necessarily mean the radiator will have more cooling capacity. The reason for that is there is a balance between tube size, number of rows, fin spacing, and tube to fin contact. Typically the more rows you have, the less efficient the radiator is due to the spaces between the tubes in the same core depth reducing fin contact. The addition of more rows of smaller tubes means very little with generally a less efficient radiator being the end result and more especially if all other things are equal.