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Re: 2005 gxp???
3.9 with VVT and active fuel management(shuts off 3 cyls when not needed) yea nice ride loaded we like it so far..
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1999 GMC 3500 SRW 4x4 7.4 4:10's FF G80
2004 Chevrolet Impala LS 3800
"ALWAYS"......  full synthetic!!!
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