Hey guys, I am a longtime lurker and new member I recently purchased a 2003 Chevy Silverado 2500HD. I was reading online and saw that the 6.0L vortec 6000 engines came with the ability to use compressed natural gas (CNG). I have this setup, and I am wondering if my truck has this capability. Is there any way to find out for sure? I bought it used and do not have the options list and I don't know much about natural gas systems. I have a station that pumps CNG close to my home at about half the cost of gasoline and could use the break on fuel costs. Any ideas on what to look for? Does the 6L automatically accept CNG as a gas substitute? Any input is appreciated, thanks.