Whats the ticking sound all of a sudden?
It sounds like a collapsed hydraulic valve lifter- a part of yoiur valve train in the upper engine. You need to have it checked at a shop you trust I don't know of any oil additives that can cure this, although someone here may give you some advice.
Loose valve train noise is common on high-mileage engines, but if it is a collapsed lifter, I think you should have it checked.
A loose timing chain will make a rhythmic slapping sound, but the ticking you describe sounds more like it's in your valve train. Have someone check it.
car was running on 3 cyclinders instead of 4 after I replaced a bad coil pack I still have a ticking noise
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