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I'll be odd man out here. 117k on 10w30 oils, either Rotella T5 or Valvoline Premium Blue. Both synthetic blends, both very good oils, with Valvoline getting the nod for value. It goes on sale at NAPA for 11.99 a gallon in the spring, and I stock up. The 6.0 will shear a 40 weight down to a 30...