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    Is Brad Penn 0w30 ok in my Jeep 4.0?

    Hi guys, I know this is the go to forum for oil questions so here I am, any help is appreciated. I have a 2000 Jeep Cherokee with 166,000 miles and I had a knocking sound at startup which goes away once it is warmed up (here is the sound with 5w30 Pennzoil Dino Oil)...
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