Well, let's see...
Starting with the additives for both gas and diesel engines,
Statements made that when you look back again are worded so that you can not actually challenge the statement.
The factual nature of some of the items presented so as to sound like facts are off the wall.
The factual nature of some of the items presented as fact are off the wall.
The claims regarding the performance of the product rival some of the farthest fetched claims I've heard regarding miracles in a bottle.
Then there's the other products...
Every product on there uses snake oil salesman phrases to sell it. "Exceeds requirements of...". Yeah, sure. Which ones. Not all of them, otherwise it would be approved. Period.
The coolant they offer and list a whole slew of specifications for... It did not satisfy a single one of those.
The power steering miracle they offer... They're chasing "inherent problems that are present in today's power assisted rack and pinion steering systems, but they don't specify what that is. They pretty much outlast the cars these days, failures can be traced back to something actually happening to them. They don't "wear out". what's to improve upon?
Selling engine oil based on a pressure gauge reading? Of course the pressure is up, you've got too thick of an oil in the engine and it's all stuck between the pump and the filter, where your pressure gauge happens to be... Instead of valid facts, tests, or information, they are perpetuating myths based on old and inaccurate information that sticks well with people who have absolutely no understanding of now an oiling system works within an engine, and then using said myth as the selling point. If they had something good to sell, they'd be selling it.
A quick look for the MSDS for the diesel shmutz shows that they keep a TIGHT lid on that... Great for trade secrets, but look up ANY other additive you can think of. The only ones that hide what's in them are ones that contain shmutz that while federally approved as an additive, are detrimental to your engine, while the products that can actually help you clean up a mess... Their MSDS does not take advantage of the trade secret rules. If they've got stuff you want in them, they advertise it that way. Alcohol in a diesel fuel additive is an example.
This product is an emulsifier according to the company themselves, which means in essence instead of protecting your fuel injection components from water, it forces it through. Bad news for wear and scoring on the fuel lubricated parts of the IP, and bad news for exploding injector tips, because even emulsified water boils when the injector opens, and it relies on liquid to cushion the collision when the spring closes it.
Bottom line, local or not he's got nothing that you want, this is snake oil at it's worst, and I'm very sure that the guy does "want to help"...