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  1. dmac_73

    2018 Z71 5.3L / PP 0w20 / 7k OCi

    This is my dad's UOA on his truck we decided to send to BSL. Hes the original owner. All prior OCIs were warranty dealer changes. The wear numbers look pretty good. The copper numbers i am assuming are from the oil cooler. I am a little concerned about the silicon. This truck is 100 percent...
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