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I have a 03 Silverado with the 5.3 with 76,000 miles and will be draining/refilling the cooling system soon.

What do you folks think of putting a couple of the GM seal tabs in for preventive maintenance?

Thanks

Bert
 

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Don't put them in if you don't have to. They tend to sit where the least amount of fluid flow is and then plug things up. I have seen heater cores plugged by tabs. I worked for GM for 13 years and would never put them in my vehicle.
 
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