What is contaminated coolant?
What is contaminated coolant? Contaminated coolant: A bad head gasket or cracked cylinder head can allow oil and coolant to mix, resulting in sludge. In vehicles with automatic transmissions, the engine-cooling system also cools the transmission. A breach in the system can contaminate coolant with transmission fluid. When to change the oil on a Duramax? Always follow the severe duty maintenance schedule if you're driving conditions include: 10,000 miles or when "change engine oil" message is displayed by the oil life monitoring system Check filter condition every oil change and replace as necessary; replace at 45,000 miles regardless When to...