Lately I've had some oil drips on the garage floor which I hope I traced correctly to the #4 spark plug tube. So I ordered a new tube and O-rings and waited for a day with a few free hours...and today was it. Sure enough, I popped out the coil pack and I carelessly flung oil everywhere, confirming that there was an issue with the spark plug tube/O-rings. I easily popped out the old tube - the boat plug worked great! The spark plug tube looked fine, but after 14 years of service and for $5, I splurged and replaced it anyways along with the new O-rings. The job couldn't have been easier thanks to Pedro's excellent instructions. Thanks Pedro! I'm hoping for another 115k miles of dry service from the engine, but if future leaks are this simple, I guess I can handle that!