My minivan withn110k on it has been a little louder than usual. Ticking and tapping when warmed up and at idle. Its quiet any other time. Not sure sure exactly what is causing the racket but i have searched and found that there a quite a few of these engine's that tap and tick like mine (3.5l toyota) anyway....i have been using maxlife 5w20 and on a whim i added a bottle of the blue stp to thicken it up. I am pleasently surprised at how it lessened the noise. What im wondering is about what viscosity am i running with 6qts 5w20 plus 1 bottle (small bottle...guessing a pint ??). On my next oci i want to get the same weight oil so as to not run the addative. Thanks for any info. If you have any other insight on the best oil for a noisy toyota feel free to let me know.