my friends mom has a daily driven 1996 nissan quest. its not in too good of condition and it didnt pass smog. when i tap the accelerator i hear ticking...i look inside the engines oil and its pretty dark...im assuming sludge is present. i told her about auto rx but she doesnt want to try it. i really want to run it in her car but i doubt she will let me. would a high milage oil help her? she is burning oil. when 3k comes up the dipstick registers on the bottom. will at least it help the car out somewhat....maybe it can get rid of some sludge...some...i wish i can really use auto rx in there. the car has about 120k. driven slow cause she is a slow driver and only for errans. i might just give her some auto rx without her knowing =) thanks.