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Zinc oil additive
How many of you guys run zinc oil additive in your motors? I have a 79 350 and getting ready to change the oil after the break in
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Chris
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1979 Chevy Stepside SPORT
2018 Chevy Silverado, 39 years apart 
My build 2008-2016. http://m.imgur.com/a/bURrE
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