07/24/2026
Customer concern: Coolant contaminating the engine oil.
Initial diagnostics show no white exhaust smoke, no excessive cooling system pressure, and no combustion gases detected in the coolant, helping rule out several common head gasket failure indicators.
Next step is a deeper inspection to pinpoint the internal coolant leak. On these GM 3.8L engines, intake manifold gasket failure is a common culprit, but every diagnosis is completed thoroughly before recommending repairs.
Proper diagnosis saves time, money, and prevents unnecessary parts replacement. 🔧🚗
