There are folks here that will tell you it's bad stuff, causes foaming etc. but I have used Lucas Oil Stabilizer with good results in quieting noisy lifters. I have seen very fast results too.
Be careful, don't over fill your crank case. Drain out your oil and put it back in less 1 quart and add the Lucas. I also just had a very positive experience with Seafoam and would recommend it based on my personal experience. I wouldn't hesitate to put both in at the same time and at the end of your trip change the oil and filter and fill with a full sythetic 5w30 or 10w30 oil. I believe your lifter noise will disappear after doing what I suggest. JMO, there are certainly people on this board that know a heck of a lot more than I do. I decided to try the Seafoam based on recommendations I read on this board and I am more than pleased with the results. I would also recommend putting a can of Seafoam in your gas tank at the start of your trip or as soon as possible before you leave.
By the way, unless you have a really bad oil leak I wouldn't worry about it until you get to where you're going, I would just make sure that you have a couple of quarts with you and check the oil when you stop for gas along the way. Fixing a slow oil leak can be a lot more expensive than just adding a quart every now and then.
[ April 01, 2005, 06:29 PM: Message edited by: stogiedude ]