[Passodeo]

Earlier today, i began to notice a loud ticking noise coming from the engine so i decided to take it to my usual repair shop to check it out. My mechanic told me that the cause of it was a bad piston and that the only way to fix it was to replace or get a rebuilt motor. I've only had the car for little over 5 months (i'm 17) so i don't really know much about it. I'd like to know what grade of oil most passport owners use, because another person told me that i might be able to get rid of the noise by using a heavier oil and an oil additive. I want my last option to be replacing the motor so any help anyone can provide will be greatly appreciated.