Does an '02 Jeep Grand Cherokee Laredo come stock with an oil breather, or is that an aftermarket addition?
No, anything made after 1967 (1965 in California) has a closed positive crankcase ventilation system. So no oil breather cap. Installing one will not give proper crankcase ventilation and will cause problems down the road (sludge, leaks, etc.). HTH. -Jim
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