Originally Posted by 04Jeepman
I recently purchased an 04 Wrangler 4.0 5 speed with 91,000 miles. Gave her the first oil change and now i have a tapping sound. I have read some other posts and heard about an additive you add to the oil that will get ride of the annoying sound. Please let me know what i need to buy and how to add it correctly. Thanks for your help
If you are sure that it is a lifter noise, then add one pint of marvel mystery oil. Walmart, Pep Boys, Oreileys they all carry it. It is 4.9 viscosity and has a very high detergent for cleaning and works very well to help eliminate lifter noise. It has been on the market for about 65 years and has a track record of success. I would run it for a couple of hundred miles and then drain it when the engine is hot. Go back with a good Conventional oil, I use Valvoline 10w30 and install a new oil filter, wix makes a good filter. This time install 1/2 of a pint and run it out until your next oil change. If it is a lifter sticking from contamination, then this should fix it.