Hi, my car recently reach its 100k mark. Been a very good car, but the engine has a little noise and vibration lately. Just so happen i found a reasonable solution, and went to my local Tesco store and grab a bottle of Tufoil.

So here are a couple of question before using it,

1) Would 1 bottle be enough for my 2.4 liter engine?
2) Is there any Precautions before using?
3) Instead of using half a bottle for the subsequent change, could i use the whole bottle (silly question)...