safety_match
Well-known member
Just a dumb question...isn't the 1990 L98 an aluminum engine thus requiring an aluminum compatible antifreeze?
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lt4man said:Green stuff should (must) be changed every two years. No matter what mileage.
Orange stuff (Dexcool) should be changed after five years if you bought vehicle when new. After the first five years, should be changed every three years.