How accurate are the ati- freeze checkers you buy?

I checked my anti-freeze level and it say +20-I had the oil changed yesterday and they said -34, what should I do??

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  • 1 decade ago
    Favorite Answer

    take your checker back and get your money back or a better one.

  • 1 decade ago

    unless your tester has become contaminated - which is a possibility at the quick change, they are fairly accurate, if in doubt lay out another 8 bucks for a new one and if it agrees with the +20 reading do something about it....

    Source(s): 30 years behind the wrench.
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