20145.oh

I have a 01 4.2 5 speed 2wd and I have had the truck for a year now I bought it with 103xxx miles and now has 114xxx miles I don't drive it anymore though because I just bought a 2014 f150 but I used to notice that it would have a slight tick while idleing when it was warm not cold and it was very quiet but that kind of stuff bothers me could anyone give me there thought on what it is and if there is oil additives I can add to remove or at least reduce the sound thanks!