Thanks for the information, I guess that on Monday I will drain a quart of oil out of the MB and add a quart of Marvel mystery oil to it. How long do I leave the marvel in the auto, does it stay in until the next oil change?? I appreciate all of the help that I am getting from everyone in the forum. If anyone else has any suggestions on my problem with the noisy lifter in my 94-E420. I would love to hear from them. Any and all help is greatly appreciated. This is all new to me and I was looking under the hood and saw all of the cosmetics covering the engine and I am a little scared to try and tackle the problem. Again thanks you to all of you, that have replied and taken the time to try and help me. Have a great day and again thanks to all who have replied. Ben