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Really depends on the coolant. If it's green it's probably every 2 yrs. The orange coolant is usually the stuff good for 100K miles or about 5yrs. If you're buying an unknown your better off being on the safe side and changing it. Then you have to watch what coolants you use, some of the orange/yellow coolant can't be mixed with the green stuff.
Really depends on the coolant. If it's green it's probably every 2 yrs. The orange coolant is usually the stuff good for 100K miles or about 5yrs. If you're buying an unknown your better off being on the safe side and changing it. Then you have to watch what coolants you use, some of the orange/yellow coolant can't be mixed with the green stuff.
Every two years. The rust inhibiting properties break down after time. Some people play Russian Roulette with it, but it will pay dividends if you follow that schedule. I also put in a bottle of Lucas Water Pump Lubricant and Rust Inhibitor. When I change my coolant it is as clean as the day I put it in and the cooling passages in the block are spotless.
Don
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