Originally Posted by idrive

Additives are waste of money if you're running top tier gas. Of course there's a lot to be said about the placebo effect.

Originally Posted by catchme2

True, but on the 17+ 3.5 and 18+ 2.7, you get DI AND port fuel injection so you get some of that fuel washing over the back of the valves.

Originally Posted by acdii

I had an 01 Crown Vic 4.6 that ran like crap. Tried different additives in the tank, and none seemed to help. Someone mentioned sucking a can of Seafoam through the PCV valve and then shut it off and let soak an hour. I did that, fixed it right up, but smoked like a crack house for 20 minutes. I would not do that on the new engines though.

For my trucks I have been using BP non ethanol 91 octane (until the store closed and could no longer get it) and got great gas mileage and never a worry about a dirty engine. Now been using Mobil 93 octane and I have doubts it is any where near as good as the BP gas, plus it has corn drippins in it. Will see when (if) the truck hits 63K how well it runs.

Originally Posted by Napalm

.some people use seafoam wrong. But I'd also recommend it if you are putting anything in your gas tank. It's what I use in all my devices occasionally. That's part of the key - Occasionally. In my DD I do it with my once every 10 month or so oil change (it takes 8.5 quarts of oil - and I replace the filter every 3000 miles regardless.

BUT - I wouldn't waste my time putting it in my ecoboost. Because it's a DI motor. Direct Injection. 1/3 the benefit of fuel tank additive is the cleaning of the back of the intake valves and the spark plugs to a lesser degree. In a DI engine this will not happen.

another 1/3 of the effect of a tank additive is to clean the injectors so they atomize correctly. In a standard low pressure injection system this does help. DI engines run at such high pressures the additive in the fuel dosen't really clean the injectors. ANd the injectors honestly don't get that dirty - because the pressure is so high they are sort of self cleaning. This is not to say DI injectors can't foul up - they can. But it's far more rare and often it's the result of poor lubrication or poor injector design.

Finally what it can do for you is help clean the tank pump and helps to nullify some of the water vapor and other stuff in the fuel tank and lines. Which you wouldn't get if you A) drive though a tank full approximately weekly and /or B) use a quality grade of gasoline. Note I don't say a Top Tier gasoline. Rant for another time but often the gas you get from the top tier places and what you get at Kroger or wallmarx is from the same refinery - minus some of the additives Exxon or BP puts in their gas. Which if you honestly don't need.

Now the techorn in a can sold at autozone etc - is good stuff too and I know people that use it. It's OK - again I wouldn't bother wasting my time. I would however in an ecoboost run 93 octane gas in it - when the Outside air temp runs over 85F

In the newest Ecoboost that run both DI and MPI (Multi- Port Injection) then I would run a can of seafoam through it (in the tank only none of that pour it down the throttle body . . . . . ) about once per oil change or once per year - depending on your use

Originally Posted by David Jones

Since the OP has a 2016, and the question was about it, none of that matters.....

Originally Posted by scsu74

What about colder than 85? The majority of the year it's under 50 here..

Originally Posted by catchme2

This is an information sharing website. Take your arrogance elsewhere.