I am with demarpaint on the Certech Gel based on the link.
I do not have a lab to prove or disprove any of the claims about the many products by Archoil.
http://www.archoil-app.com/About-Us.html
It is the tests and case studies at the bottom of the above link that impresses me the most when it comes to additives. Usage in a million dollar machine carries more weight with me than in say a $2000 car.
I grew up around machines on the farm. I have some training and on the job experience in tool and die shop and the same in electronics when in the Navy. Later I earned my doctor of optometry degree which helps when reading technical test results.
Most of the remarks about additives are little more than marketing hype. Most additives even when they work do not add "functional" life to most cars or trucks.
Below are some links that get my attention as showing some validity.
http://www.trucktrend.com/how-to/parts-a...ne-diesel-tech/
http://www.ford-trucks.com/forums/1123418-archoil-products.html
http://www.powerstroke.org/forum/general...oil-ar9100.html
I have a hard time calling all these accounts just [censored]. After having read many hours of post by vehicle owners using Archoil additives I sold on the fact that many users are 'sold' on archoil.
We know esters can make good cleaners. The anti-friction part sounds positive. I can seem to hear less rattle in the 1976 265 Massey Ferguson 60 HP Perkins diesel engine using AR9100 and AR6200 but that is not true science.
I am not sure of the net value of AR9100 and AR6200 in our applications but at the age of 65 I do feel the Archoil line of products are in no way harmful to any of our machines after using it over the past couple years. We have engines that do not get started for perhaps a year. If AR9100 helps prevent dry start ups then it is a plus.
If I had equipment that cost millions to purchase I expect I would be a serious Archoil user. Companies that offer products by 55 gallon drums indicates it more than a one person operation rebottling chemicals in my view.