GMC Terrain oil leak due to frozen PCV valve, recommended replacement on GMC Terrain

Some GMC Terrain owners report experiencing oil leaks due to a frozen PCV valve, which can lead to excessive crankcase pressure. These owners often find that following the manufacturer's repair procedures is essential for effectively addressing the leaks. Additionally, they may need to clean oil residue under the vehicle and replace the oil filter while refilling the crankcase with engine oil. Some owners consider purchasing a new oil cap and installing a pressure relief valve to mitigate issues during cold weather. If the oil leak is traced back to the rear main seal, it is crucial to inspect the PCV system, dipstick, and engine oil fill cap for ice or moisture buildup. Furthermore, checking for excessive blow-by through compression and cylinder leakdown tests can reveal underlying problems that contribute to moisture in the crankcase. Technicians recommend draining the engine oil for at least 15 minutes to ensure all oil and condensation are removed, and they should inspect the PCV orifice for blockages to prevent future leaks.