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Discussion Starter #1
I have a 2007 5.9 and just started using Mobil Delvac 1300 15w40. Anyone else using this oil? Is it any good? Also, I have a Bully Dog GT with driving coach, S&B intake and elbow and 5" magnaflow exhaust that I just replaced muffler with Aero 5050. How much horsepower do I have? Truck came stock with 325 hp. Very pleased with sound of Aero 5050. Thanks
 
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