CHEVROLET LUMINA ENGINE TICK

When I First Start Car Theres A Ticking Sound Until It Warms Up Then It Stops What Could This Be

I Have A 1998 Chev Lumina And After Having My Oil Changed By A Mechanic, I Now Have A Constant Ticking Sound Coming From The Engine. I...

Hello Ladies And Gentlemen, I Bought A Second-hand Car About Two Months Ago Which Started Developing A Ticking Sound From The Engine Bay....