Why did anyone HAVE to say it? We were ALL advising you to use RTV. And yes, every single cork gasket ever made dries out, gets saturated with oil and leaks. That's the nature of the beast. Look, it's not anybody else's fault that you didn't choose to follow our advice. I don't tell the whys and wherefores about a lot of advice I give. If you wanted to know why, that's your job to ask. But, as I said, the cork will seal for a while, but it will leak, eventually.