PHROG Posted May 23, 2016 Report Share Posted May 23, 2016 To me my 92 G/P is a "late model", so I have just recently become concerned as to it's need for ZDDP. Is The camshaft in the 3.1 V6 a flat tappet or roller lifter? My other vehicles range from 34-78 all w/flat tappets except the 34 is awaiting aZZ4 install w/rollers. THANX, Roger Quote Link to comment Share on other sites More sharing options...
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