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I've had diesels before and always used additives. With nothing but biodiesel available where I live, I currently use Opti-Lube XPD. It makes a difference IMO. Seems to run smoother and quieter, even during regens.

My Sierra 1500 loves the open road. In town driving, not so much.

I'm loving the MPG so far. Haven't taken a road trip yet but will be heading up to Spokane in another week.

Did you ever figure out what was causing the vibration?