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98 lesabre coolant in oil after intake manifold replacement

Guest vlg

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I have a 98 lesabre 3.8L series 2 motor,After the lower and upper intake manifolds were replaced the crankcase filled with coolant.Oil and filter was drained once because we though coolant got in oil when intake was off but it filled with coolant again aftewr a few days.Someone looked at it and said it was a crack in the rear head-i don,t beleive iit since the problem was never present until intakes were replaced for a check engine light-code P0174,The light never came back on but this happened now-any ideas?>

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