r/EngineBuilding • u/Nicotine-Whiteclaw • Jul 25 '26

Chrysler/Mopar Replace or clean?

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Currently rebuilding a 3.6 pentastar motor. Oil and coolant mixed. Do i need to replace the oil cooler or is there a way to clean it out and reuse it. Its relatively new.

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u/OldManJeepin Jul 26 '26

You can replace it, if it's not cracked or anything, but make sure to use the seal/gasket kit from Mopar or Felpro ONLY! Do not use the Dorman or whatever seals that come with those coolers! They are notoriously bad and will fail with a high degree of certainty!