Did you know?2003+ models featured darker cladding.
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That's all that I use. I can't say that I saw any improvements in performance or milage but both the Vortec and the Vortech seem to like it.
Been using Mobil 1....My "seat of the pants dyno" says better performance...Budheat
I tried it and didn't notice any difference whatsoever, had the dealer do it last time and I think they put in a syn blend