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Hello all, I've been following the board for ar least 10 years and appareciate all the information. I keep all my vehicles at least 15 years so oil is very important to me. I generally use Amsoil or Mobil 1. My pickup is an 05 Silverado, 150,000 miles, 5.3, 4L60E, 8.625" 10 bolt rear end. It's...