Hi All, I Have A '00 Eldo Esc With Aboiut 50k Miles. For The Past 5 K Miles Ive Heeard A Tapping Noise At Idle, Non Steady, And Worse When The Engine Is Hot. Sometimes When It Was Cold I Wouldnt Hear It. Now I Seem To Hear It All The Time Cold And Hot, And Still At Idle. I Work At Ford Motor Co. So I Took My Car In The Back, Had The Techs Licten To It With Thier Chassis Ears, And They Seem To Think The Noise Is Coming From The Timing Cover In Front, Or Possible The Serpintine Belt Tensioner Is A Little Loose, Or Even A Lifter Noise. I Seem To Hear The Noise From The Rear Bank, But They Seem To Think Its Coming From The Front Head. If Any One Has Had A Similar Problem Pleas Elet Me Know, Or If They Have Any Tips For Me. I Use 5w-30 Mobil One Full Syn. Always, With Ac/delco Filter. My Last Oil Change I Used 10w-40 To See If There Would Be Any Change In The Noise. The Noise Isnt Really That Loud. Im Not Sure What A Lifter Sounds Like If They Are Pumping Up. Thanks Guys!