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    87 yj jeep wrangler IL6 4.2l stick: oil preference

    Hi everyone, I am new here. Have some questions about my fav old friend. I bought this jeep in Oct last year. 168,000 odo. Ran fine. Around end of Nov, I changed oil to 5w 10 synthetic Mobil. Shortly after I hear big tapping noises when I start in morning ( later I was informed "lifters"). Then...
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