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  #13  
Old 07-02-2015, 07:33 PM
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Re: Anyone Here Use Fuel Additives ?

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Originally Posted by Lightninrod View Post
Well, I poured in 9oz of Lucas Upper Cylinder Lubricant into a half full tank of my 2013 V8 yesterday. Then filled it up with Shell 93 octane. I bought it used a few months ago. It now has 52k on the odometer. This is one additive that has no ether in it. Ether can attack some parts used in the fuel system.

Have only put less than a hundred miles on it since then so no results yet.

Dan
So let me get this straight. You used an additive that is not recommended, then filled the tank with the incorrect fuel grade? Why did you put 93 in it?

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  #14  
Old 07-02-2015, 07:47 PM
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Re: Anyone Here Use Fuel Additives ?

I always use 93 octane in my Jeep Grand Cherokee Overland V8. I use it in my wife's Murano too. My vehicle's User's Guide recommends 91 octane. Two more octane points is not going to harm it and neither will the Lucas additive.

Dan
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  #15  
Old 07-02-2015, 09:35 PM
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Re: Anyone Here Use Fuel Additives ?

There is a funnel next to your spare tire.


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  #16  
Old 07-02-2015, 09:54 PM
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Re: Anyone Here Use Fuel Additives ?

Quote:
Originally Posted by Lightninrod View Post
I always use 93 octane in my Jeep Grand Cherokee Overland V8. I use it in my wife's Murano too. My vehicle's User's Guide recommends 91 octane. Two more octane points is not going to harm it and neither will the Lucas additive. Dan

I agree. I'm using 91 octane Premium in my Grand Cherokee 5.7 V-8 as well. It's always better to run too high of an octane, then too low of one. Especially out here this time of year when it's 115 most every day in June. I even run it in my 91 Ford 5.0 F-150. It knocks under hard acceleration if I don't. And I know the Jeep has higher compression.
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  #17  
Old 07-02-2015, 11:46 PM
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Re: Anyone Here Use Fuel Additives ?

Quote:
Originally Posted by Lightninrod View Post
I always use 93 octane in my Jeep Grand Cherokee Overland V8. I use it in my wife's Murano too. My vehicle's User's Guide recommends 91 octane. Two more octane points is not going to harm it and neither will the Lucas additive.

Dan
Oh ok, without busting out the manual, I was under the impression the manual recommended mid grade 89 octane and states that regular 87 is acceptable (for the V8), and 87 is recommended for the V6.
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  #18  
Old 07-03-2015, 08:45 AM
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Re: Anyone Here Use Fuel Additives ?

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Originally Posted by JTS97Z28 View Post
Oh ok, without busting out the manual, I was under the impression the manual recommended mid grade 89 octane and states that regular 87 is acceptable (for the V8), and 87 is recommended for the V6.
You are correct.
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  #19  
Old 07-03-2015, 08:52 AM
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Re: Anyone Here Use Fuel Additives ?

Since I bought my Jeep, I've noticed several stations by me have discontinued "Mid Grade" 89 Octane because of sluggish sales. They devoted those tanks and pumps to 87 Octane regular. So given the choice, I'll run 91 Octane and play it safe.

If I'm not mistaken the 5.7 HEMI has 10.25 to 1 compression. That's pretty high. Similar to a lot of the high performance motorcycles. They ALL run on Premium. For the amount I drive the cost isn't enough of a factor to worry about.
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  #20  
Old 07-03-2015, 08:59 AM
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Re: Anyone Here Use Fuel Additives ?

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Originally Posted by MDBones View Post
You are correct.

True, but 93 makes the paint shine better and stops the wipers from streaking the windshield. Actually that's just a guess but it must do something for the extra money.

It is true that on older vehicles higher octane will compensate for carbon build up. The build up in the combustion chamber increases the compression ratio requiring the higher octane. Almost like milling the heads. A good top cylinder cleaning will bring the ratio back down.

On newer vehicles the computer compensates by retarding the timing. Not a perfect solution because you lose a little power. It does avoid the need for higher octane.
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  #21  
Old 07-03-2015, 09:05 AM
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Re: Anyone Here Use Fuel Additives ?

People can spend the additional money on premium gas if they want to but the manual states there's no benefit in doing so.

3.6L Engine — If Equipped

This engine is designed to meet all emissions regulations and provide excellent fuel economy and performance when using high-quality unleaded “regular” gasoline having an octane rating of 87. The use of premium gasoline is not recommended, as it will not provide any benefit over regular gasoline in these engines.

5.7L Engine — If Equipped

This engine is designed to meet all emissions regulations and provide satisfactory fuel economy and performance when using high-quality unleaded gasoline having an octane range of 87 to 89. The manufacturer recommends the use of 89 octane for optimum performance. The use of premium gasoline is not recommended, as it will not provide any benefit over regular gasoline in these engines.

Light spark knock at low engine speeds is not harmful to your engine. However, continued heavy spark knock at high speeds can cause damage and immediate service is required. Poor quality gasoline can cause problems such as hard starting, stalling, and hesitations. If you experience these symptoms, try another brand of gasoline before considering service for the vehicle.

Note: The emphasis is on using a high quality grade of gas in the recommended octane rating, not the highest octane rating you can find.
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  #22  
Old 07-03-2015, 09:07 AM
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Re: Anyone Here Use Fuel Additives ?

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Originally Posted by bill_de View Post
true, but 93 makes the paint shine better and stops the wipers from streaking the windshield. Actually that's just a guess but it must do something for the extra money. :d
Good one!
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  #23  
Old 07-03-2015, 09:47 AM
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Re: Anyone Here Use Fuel Additives ?

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Originally Posted by MDBones View Post
"Light spark knock at low engine speeds is not harmful to your engine. However, continued heavy spark knock at high speeds can cause damage and immediate service is required."
The biggest misconception in using a higher octane rated fuel is that you'll get more power, along with better gas mileage as a result. None of that is true.

The only thing higher octane fuel delivers over a lower octane blend is a greater resistance to spark knock, and in extreme cases, detonation. That in itself to me is worth a few cents more a gallon in order to eliminate the possibility of either occurring. Especially in the high temperature desert climate I live in. This condition is even greater when towing or climbing any type of long grade with the engine under a greater load.
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Old 07-03-2015, 09:49 AM
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Re: Anyone Here Use Fuel Additives ?

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Originally Posted by billt View Post
The biggest misconception in using a higher octane rated fuel is that you'll get more power, along with better gas mileage as a result. None of that is true.

The only thing higher octane fuel delivers over a lower octane blend is a greater resistance to spark knock, and in extreme cases, detonation. That in itself to me is worth a few cents more a gallon in order to eliminate the possibility of. Especially in the high temperature desert climate I live in. This condition is even greater when towing or climbing any type of long grade.
That's what your engine computer is for.
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