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  1. M

    Renewable Lubricants and why copper additive

    I'm a newb, so go easy if this has been discussed. I switched to RLI 10w30 HD in my LS7 and the UOA looked great, but copper spiked. The previous oil was Castrol Edge (it did well too). Here is an article that explains why...
  2. M

    Renewable Lubricants, Inc. 10w30 HD 3900mi LS7 Z06

    Street driven like last time. Very similar except the copper is high (I heard it's an additive in this oil?), and the TBN and viscosity are fantastic.
  3. M

    Valve guide wear & UOA

    Can a UOA register wear metals caused by valve guides wearing? Specifically, the exhaust valve guide, which also has an oil seal. Thanks Mark
  4. M

    Castrol Edge 5w30 3700 mi 09 Z06

    No track days, but semi aggressive street driving. [/img]
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