You dont need to use an additive, but IMO its needed.
If you do use an additive read the product label & make sure it doesnt contain alcohol & wont harm the DPF.
I notice a big difference in the trucks performance when using an additive vs not using an additive.
For my own reassurance, I use an additive on every fill up. Im not relying on the fuel stations additives.
Specially in the winter time.
Sierra 2500HD SLE CC/SB 4x4 LMM
Edge Insight CTS,
Flo~Pro 4" DP back exhaust w/ muffler & stock trumpet tip,
Resonator delete plug,
Alum. bleeder screw,
WIF sensor delete plug,
Fumoto oil drain valve,
Pacer LED cab lights,
GM dually light bar under tailgate,
Cobra 29 WXNWST
Wilson 2000 CB antenna,
GM chrome oval running boards,
Michelin M/S2 on PY0 wheels,
Rubber mud flaps,
Curt class IV hitch
Last edited by HD Dmax Machine; 10-22-2011 at 04:28 PM.