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Discussion Starter #1
1997 eldorado. Changing the anti freeze by draining the radiator, seems to get only a gallon or so out. I did this last year and added the crushed tabs to the lower radiator hose. If I drain out the same amount this year, to try to "purge" the old anti freeze out, do I still have to add the stop leak pills? I mean, when is too much too much with the sealant pills?
 

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2010 DTS
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Remember that you will not get all the coolant out, thus you'll still have some of the sealant tabs in there as well, so if you are going to use them, use half of what you would have used. I might add that GM no longer recommends nor uses them unless there is a problem. Neither do I for what it's worth.
 
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