I saw this at O-Reilly's the other day and then I was in my garage today and there was a can in a box on the shelf. Good product or no?

 

what does it do?

 

Seriously

 

It's a additive that can be added to either your fuel tank or crankcase. Like any other products on the market

 

It says to put it in the PCV valve while the car is running at high idle until it stalls out. Then you wait 5 minutes and restart the car and let it run. I've never heard of anything like this before, that's why I asked if anyone had used it. Pour it in the PCV valve????

 

prolly do more harm than good.

 

I have used it but not in my Max, of course

It is mostly naphta (commonly used to remove carbon build-up) and pale oil. You can use it in the gas tank, as a fuel system cleaner and in the crankcase for slowly removing varnish and carbon deposits. Put 1.5 oz per quart of oil in the crankcase 500 miles before time for an oil change and about 1 oz per gallon of gas in the gas tank to clean the fuel system in my wife's minivan ('97 Villager). It worked ok (basically it didn't break anything) and the van seems to be running a bit better.
I did not pour it down a vaccum hose though.