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@jrblackbox Yes I did get a PPI done. They found a few non-mechanical issues. Said everything was mechanically good, but I just know that sound is not normal.
@nnewell I just checked out the video with the stuck lifter and while its a very similar type of knocking sound, it's nowhere near as loud as that...And I'm not sure if the sound of a stuck lifter increases with time, but so far it hasn't.
@jmatta and @Mark_T It does have Castrol 5w40 in it right now. I actually got an oil change a few days after I purchased the car. And I'm not sure what oil the previous owner had, but it made that slight sound before and has still done it after the oil change.
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