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Re: Octane level and 2012 Ram 5.7 engine.
[Re: Junky]
#1421838
04/18/13 05:19 PM
04/18/13 05:19 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Manual says mid grade of 89. If I need gas and 89 is not available should I run 92 or 87 octane? Does the engine computer adjust for the difference. Does it even matter?
Our 05 durango with a hemi says the same thing, 89 octane. We have ran 50K miles now with mostly 87. When we do put some premium on top of the 87 it does run better.  So far so good and it has 100K on it now.
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: Junky]
#1421839
04/18/13 05:21 PM
04/18/13 05:21 PM
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Joined: Oct 2012
Posts: 1,106
Northeast
VincentVega
super stock
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super stock
Joined: Oct 2012
Posts: 1,106
Northeast
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mine says 89 recommended, 87 OK, but it is an earlier generation. Follow the manual. If is says 87 Acceptable, then OK. Anything higher (92+) is fine, it won't hurt anything. You just are paying more for a tank of gas
I wouldn't tow or haul with 87, especially in hot weather.
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: 68LAR]
#1421843
04/18/13 09:00 PM
04/18/13 09:00 PM
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Joined: Jan 2003
Posts: 6,266
Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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Quote:
My 2011 Ram also recommends 89, but 90% of the time it gets 87. I do treat it to some 93 once in a while, but I really don't notice any difference in the way it runs. 
 Same for my 2010 2500
Quote:
I've had 3 and they always call for 89. I run higher if its not available. With 87 you are depending on the knock sensor to take timing out to keep the engine healthy. One time this question came up, a poster said he always ran 87 until a piston got "holed" at 50k. After repairs he ran 89+. I guess his knock sensor wasn't up to snuff.
The motor isn't likely to detonate unless overheated or under heavy load. Under normal operating conditions, daily driving, you aren't likely to experience any adverse effects. If you are towing heavy, working the truck hard or its hot out, probably better off with the 89.
-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: 05dakota]
#1421844
04/18/13 09:01 PM
04/18/13 09:01 PM
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Joined: Jul 2003
Posts: 1,212
Canton, Ohio
Crazy68Dart
pro stock
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pro stock
Joined: Jul 2003
Posts: 1,212
Canton, Ohio
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Assuming the knock sensor is working it will cause timing to be pulled out if it senses detonation reducing performance and fuel economy to save the engine.
I know this is way off topic but I had a 98 GTP which called for 92 in the manual. It ran noticeably worse with anything less than that (only did it a few times). Under load it would detonate and you could literally feel the timing get pulled when it occurred. I liked to run Sunoco 94 in it which made it run even better. No joke.
Given the choice between low and high grade, run higher if you can. In the grand scheme of things it is only a couple of bucks more.
383, Hemi 4-Speed, AlterKtion, D60
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: ahy]
#1421845
04/18/13 09:06 PM
04/18/13 09:06 PM
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Joined: Jun 2008
Posts: 2,336
Ball Ground, Georgia
Dixie
top fuel
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top fuel
Joined: Jun 2008
Posts: 2,336
Ball Ground, Georgia
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Quote:
I've had 3 and they always call for 89. I run higher if its not available. With 87 you are depending on the knock sensor to take timing out to keep the engine healthy. One time this question came up, a poster said he always ran 87 until a piston got "holed" at 50k. After repairs he ran 89+. I guess his knock sensor wasn't up to snuff.
Had the same thing happen to me at approximately 100K miles on the way back from Carlisle. Drove it back pulling a trailer with 2 burned pistons. Got 5 MPG, but it made it !
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: Dixie]
#1421846
04/18/13 09:29 PM
04/18/13 09:29 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
I've had 3 and they always call for 89. I run higher if its not available. With 87 you are depending on the knock sensor to take timing out to keep the engine healthy. One time this question came up, a poster said he always ran 87 until a piston got "holed" at 50k. After repairs he ran 89+. I guess his knock sensor wasn't up to snuff.
Had the same thing happen to me at approximately 100K miles on the way back from Carlisle. Drove it back pulling a trailer with 2 burned pistons. Got 5 MPG, but it made it !
Whoo, I have always ran premium when towing in any vehicle. They are working really hard as you know now, so sorry to hear that.
My wife drives her durango to work and back for the most part. We don't tow much with our hemi, I have a dually for that. But now you guys are scaring me into mid grade more often. 
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: Junky]
#1421848
04/18/13 10:07 PM
04/18/13 10:07 PM
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Joined: Oct 2012
Posts: 1,106
Northeast
VincentVega
super stock
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super stock
Joined: Oct 2012
Posts: 1,106
Northeast
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Nope. Running more octane than you need is a waste - it's actually slightly less efficient (unless, as stated, your engine is running hot/pinging/detonating when it shouldn't be). Octane is introduced as a chemical, and 92 will have more of it, and it will actually retard the burn in addition to displacing some of the gasoline. That means slightly lower energy content. That's why, unless the engine needs it, it's a double waste to run extra octane.
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: VincentVega]
#1421849
04/18/13 10:18 PM
04/18/13 10:18 PM
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Joined: Oct 2005
Posts: 4,954
WI
Dcuda69
master
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master
Joined: Oct 2005
Posts: 4,954
WI
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Quote:
Nope. Running more octane than you need is a waste - it's actually slightly less efficient (unless, as stated, your engine is running hot/pinging/detonating when it shouldn't be). Octane is introduced as a chemical, and 92 will have more of it, and it will actually retard the burn in addition to displacing some of the gasoline. That means slightly lower energy content. That's why, unless the engine needs it, it's a double waste to run extra octane.
Absolutely and well stated!!   
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: Junky]
#1421851
04/19/13 01:35 AM
04/19/13 01:35 AM
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Joined: Feb 2003
Posts: 2,810
Sobieski Wi
bee1971
master
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master
Joined: Feb 2003
Posts: 2,810
Sobieski Wi
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My 2011 has never seen 89 Octane so far
My 2004 never saw 89 Octane in 50,000 miles either
Right from the owners manual
87 Octane Acceptable. 89 Octane
Recommended.
Component Fluid, Lubricant, or Genuine Part Capacities
Fuel Selection
3.7L, 4.7L
87 Octane 1500 Regular Cab
Shortbed/Crew Quad
Cab - 26 Gallons
(98 Liters) 1500
Regular Cab
Longbed/Crew Quad
Cab (Optional) -
32 Gallons (121 Liters)
2500/3500 Shortbed -
34 Gallons (129 Liters)
2500/3500 Longbed -
35 Gallons (132 Liters)
Fuel Selection
5.7L
87 Octane Acceptable. 89 Octane
Recommended.
1500 Regular Cab
Shortbed/Crew Quad
Cab - 26 Gallons
(98 Liters) 1500
Regular Cab
Longbed/Crew Quad
Cab (Optional) -
32 Gallons (121 Liters)
2500/3500 Shortbed -
34 Gallons (129 Liters)
2500/3500 Longbed -
35 Gallons (132 Liters)
1971 Dodge Charger Superbee
2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded
Siberian Huskies
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: Kern Dog]
#1421853
04/19/13 09:47 AM
04/19/13 09:47 AM
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Joined: Oct 2012
Posts: 1,106
Northeast
VincentVega
super stock
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super stock
Joined: Oct 2012
Posts: 1,106
Northeast
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I rarely romp on my hemi, but I did think once I could tell the difference between 87 and 89. As I mentioned earlier, it does say 87 acceptable in the booklet, but this is a Gen 1 and I don't know if the newer ones say it.
I thought it ran up through the RPMs a little better on 89. They're fairly loud even stock muffled, so it's probably hard to hear pinging/knocking. Like most said, on 87, it's no doubt going to retard timing now and then. But it shouldn't cause damage unless you abuse the vehicle, have a lot of carbon deposits, or are doing heavy towing
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: Junky]
#1421854
04/19/13 10:11 AM
04/19/13 10:11 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Good info, guys. Keep 'em coming.
Question: Will running 92 give better mileage offsetting the slightly higher cost over 89 octane?
no.
my 2011 charger owners manual says 89 recommended, 87 acceptable. I've run both and haven't seen a lick of difference in performance or fuel economy. I'd run 87, but if you plan on towing, where the engine is going to be under heavy load and generating more heat, then I'd probably fill up with 91+....
FWIW, a while back on one of the LX forums, someone did dyno testing of a stock 5.7 chally with different grades of gas...IIRC it made 328 at the rear wheels with 89, 325 with 87, and 323 with 91 or 92....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Octane level and 2012 Ram 5.7 engine.
[Re: Crazy68Dart]
#1421856
04/19/13 12:08 PM
04/19/13 12:08 PM
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Joined: Jan 2003
Posts: 6,266
Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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Those of you who say you can feel a difference between 87 and 89 are noticing a placebo effect. I've made 1/4 mile runs with 87 and with 89, there is not a dramatic difference.
-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
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