I use Speedco also and they did the oil analysis right there on location. One big mail-in oil analysis place is Blackstone Labs. You can also get a kit from Napa auto parts stores, it may be Blackstone as the lab?
Blackstone link: Blackstone Labs
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2005 Kenworth Showhauler 45 ft total length
twin screw, 450 hp ISX, 10 speed Ultrashift
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