With all the posts lately about fairly new...at least to me...oil additives, I get the feeling that some of us are willing to read and research and even consider using some of them while others are staunchly opposed to adding anything to they're engines other than oil. I have NEVER added ANYTHING to my vehicles engines. However, after reading so many posts about additives, I'm beginning to wonder if they're might be some additives that might be of benefit for our vehicles. I might have inherited...involuntarily, some of this curiosity when I bought a 2005 Chevy Avalanche a few weeks ago that had an additive called friction free 3000 added to the oil from the 12,000 mile mark all the way to the 162,000 mile mark when I bought it. I requested the service history from the shop that serviced it and noticed the friction free on each oil change and asked the shop owner about it. He said it was an additive that is designed to adhere to the moving parts in the engine and to prolong engine life by reducing wear at critical parts...put simplistically for my simplistic brain to understand! Yes...I know engines will run hundreds of thousands of miles without additives with proper service, but i'm probably going to continue using the additive and see what happens. The mileage on it now is mostly highway miles but I will use it mostly on short trips with change intervals being done by going by the OLM. I posed this question a few weeks ago asking what the friction free 3000 was, snake oil I presumed, but since I have read alot about some other additives that have Boron in them and it seems that some people more knowledgeable than I am have favorable things to say about them. I am impressed at how smoothly the 5.3 runs and my first MPG check yielded an 18.9 MPG in only city driving, pretty good for a 6,000 lb vehicle. I might have to use it as a BITOG test mule...LOL!