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2012SLK 350 – Mostly in the cold of the winter but any time after the car sits forover a week to ten days, when I start the engine I hear what in the old days Iwould call a sticking lifter or valve. Tap, tap, tap. It usually lastabout 10 to 45 seconds and does not do it when the engine is warm. I live a significant distance from the dealerso they have never heard the noise. Itis embarrassing if friends happened tobe with me and keeps me awake at night wondering if this is a serious issue. My warranty is up soon so I am wondering ifthis is cause to consider purchasing the extended warranty to protect myself. Doesanyone have thoughts about what this noise is all about? :frown: