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I have a 1997 Jeep TJ Wrangler 4.0 with 171K miles on the clock. This mechanic at work is making me very nervous telling me that the oil pump on the 4.0L takes a dump between 150 and 200 thou miles and I should be aware of this..Im a worrier and he's got me going now. Anybody have any input on this and what I should do? the engine runs great. When I start it cold it has 50 lbs oil pressure. when its warmed up its 40 while driving and 20 sitting at a light. Sounds normal to me but have any of you had issues with the oil pump? He says when it goes its too late..New motor time..