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120,000 high speed highway miles on a car that had the engine replaced at about 88,000 miles. I assume that I had fresh antifreeze put in the new engine when it was installed two years ago. The car has always lived in South Carolina year-round translating into hot summer and mild winter driving. When should I change my anti-freeze? Should I have it tested first and base my timing on the result? Is $59.99 a good deal for flush and new coolant? Any specific recommendations and/or considerations I have not thought of? Thanx.

Answers from the Automotive Experts

Colleen McGee, Driving Instructor at Americas Driving School Hi Stevie If you have the traditional green antifreeze, it should be replaced every 2 years or 30,000 miles. If it is red antifreeze it can be good for 5 years or 100,000 miles. Since a radiator flush costs on average $90.00-$150.00, you got a very good deal. Happy driving! Colleen

Jo An Holt, Automotive Journalist at Holt & Associates My mechanical expert recommends a BG coolant flush every 30K miles or 2 years. Anything less than $80 is a great price. Just make sure they use quality fluids.

Karen Salvaggio, Owner - Professional Race Car Driver at Thunder Valley Racing Changing your antifreeze every two years or 30,000 miles is the industry standard. In the last 5-8 years, auto makers began using a newer blend of antifreeze that is reported to retain its corrosion inhibiting ability for up to 5 years or 100,000 miles. The length of time your antifreeze will retain its corrosion preventative ability is greatly dependent upon the number of aluminum parts in your car's engine, including water pump, heads, intake manifold, etc. That said, the $59.95 cost of changing the fluid is a very reasonable expense for the preventative protection it will provide your engine. Change the fluid.

Stephanie Gutierrez, Marketing at Victory Auto Service & Glass Stevie, we recommend that you have your cooling system (anti-freeze) flushed every three years or 30,000 miles to properly maintain the system. Testing will tell you the temperature it is good to, however the main purpose to have the system flushed is to prevent corrosion of the radiator and other cooling system parts. The average price for flushing your cooling system will generally range between $100-$150 depending on what you all have done with the service.

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