Super Unleaded
 

Does anyone use Super?? Will it really hurt my 5.4L if I use it.

Why would you want to use it unless you have a tuner. Your engine was designed to run on 87 octane. To use other is a waste of money and will get you no better performance.

Exactly. Unless your tune requires it, or have spark knock (which sould be repaired anyway), don't use it.

The Only Reason I Want To Use It Is Because I Can Get It For Free...... And I Cant Get Regular Unleaded For Free. That Is Why I Am Trying To Find Out If It Will Hurt My Truck

It won't hurt your truck. If it's free, use it and share with us how you get free gas.

Stealing gas from work isn't free:smoke:

it will in no way HURT your truck if you use a higher than recommeded octane level. You will not see any gains from using it, but it will not hurt your truck either.

If you engine isn't optimized for use with premium fuel, like with a tuner or something, there's no sense in it. You'll actually get a little worse performance and fuel mileage.

In general, run the lowest octane fuel you can get away with.

Explain to me where you can get free gas, I would like to know that one since my truck requires high octane fuel. :coffee:

as mentioned previously it will hurt perfromance. whether or not it is noticeable is debatable.

the higher the octane the slower the burning

cmon ppl. read everything before you reply. i think you went and frustrated the guy and thats why he isnt replying.

he obviously doesnt care about performance. all he wants to know is if it will hurt his truck or not. if i got free gas i wouldnt care if i got 2 mpg.

it won't hurt your truck... it should run better and keep your engine cleaner bc of the additives in it. i spoke to a mechanic about it a while back bc i was hearing alot of diff **** about it.

There is no benefit. It won't gain you anything. I will burn cleaner, resulting in perhaps less deposits over time, but the expense outweighs the benefit:thumbsup:

everyone freaks out about the expense. have you calculated what you are saving by getting the lower octane gas? like 2-5 bucks per fill up. big savings eh?

We need an engineer to chime in here.

From the limited research I have done over the years I have learned that it will indeed harm your engine.

On the contrary it will in fact cause MORE deposits due to the fact that it burns slower and the engine has no way of knowing that there is slower burning fuel in there. Therefor the timing is not adjusted properly so in turn you get excess carbon build up.

Other than that I believe it is harmless to use it.

my .02

peace-