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Engine starting to get a lifter Knock

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Good morning to all. I have a question about what kind of additive or oil I should add to help with this slight knocking. It started about 2 weeks ago in my ladies 1999 Jeep Cherokee sport (inline 6). It has 137k on it and has always been well maintained (regular oil changes, filters, injectors cleaned yada yada yada). I was thinking about adding Seafoam (as I love this stuff). Anyway, do I need something with a more of a detergent affect or something else. We do not have the money (both of us are going to Grad School...broke as joke :smart: ) to rip this engine apart. HELP Please.






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