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Unread 11-11-2015, 04:04 PM   #1
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Default coolant change interval

My mechanic who has been honest with me for the past 20 years insists the coolant needs to be changed every two years. He said GM tried to make it last to 100,000 miles and found it doesn't last. The rust inhibitors get weak even though the coolant does not. Everything I can find on the internet confirms if you buy the long lasting type it can last 100,000 miles. What gives? thanks.

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Unread 11-11-2015, 07:52 PM   #2
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2 years isn't quite necessary, but no, coolant does not last 100k. Look up the Dexcool lawsuit.
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Unread 11-12-2015, 02:29 AM   #3
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There is not a single type of fluid that runs in the car which does not require replacing. Even long-life coolant, transmission oil, differential oil and power steering fluid - they all need replacing at times.

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Unread 11-12-2015, 09:39 AM   #4
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2 years is conservative, 3 years is when you definitely want to get around to changing it.

What does your manual say? What does the manufacturer recommend? If the manufacturer recommends it, then it's a pretty safe bet.
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