A few years ago I was snow skiing in Colorado and rented several different cars. Regular gas was 85 octane. I was concerned that the cars would run crappy with that gas. The cars seems to run just fine with it even though there were some huge grades to climb. The only way to be sure is to try some and see how the engine performs. Again if you can't hear the engine spark knock under acceleration the octane is adequate. Unless you are planning to drag race you are wasting your money to buy more octane than the engine needs...the engine doesn't have feelings...once you have satisfied its basic needs.. running higher octane does nothing but lighten your wallet!
Oh yes, one fellow said I didn't buy a 300C for gas mileage.....Well I did. My 5.7 H.E. gets better gas mileage than several of my sub 3 liter engines and yet its roomy and luxury enough for an old retired man.....
Car: 2007 Chrysler Inferno Red 300C, SRT Design group
Join Date: Dec 2007
Member Number: 15499
Location: Hickory, NC
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Quote:
Originally Posted by chuckkent
The Chrysler SRT Design is a 3L V6 diesel sold in UK. Now I'm really confused....
True, but in the US (so far) the SRT Design is a 5.7L with MDS. In '07, it was an options package available on the Cs. For '08, it's a model designation, similar to how they market the HE. Who knows what they'll do when they finally bring the diesel to the States.
Not in Nebraska. But I have seen it in a Wall Mart, SW of Des Moines, near Pella, Iowa. I was surprised too, since I only saw it in Utah and Colorado before. Fuels avaiable were 89,87 and 85 octane. Of course the low price for the 85 octane is what made me stop there for gas. Bait and switch.
HKS
Quote:
Originally Posted by Husker
Do you mean E85?? I have never seen 85 oct anywhere in Iowa/Nebraska
After reading some of the articles concerning octane, I thought I would share a bit of information with other readers.
First, as I have stated before, by using any gas that has alcohol in it, you will loose about 5% gas mileage per 10% alcohol in the blend.
Second, you can use a trick some oil companies use in making gas.
You can add 1 oz. of 100% pure acetone, per 5 gal. of gas to artificially reduce spark nock. You can use 87-octane gas without any spark nock on the 5.7L Hemi.
How this works: You probably have heard of summer and winter gas!
The winter gas has more acetone added in the blend to increase fuel vaporization rate, which can also reduce spark nock tendency. This will work fairly well unless it is in very hot weather.
This method of detonation suppressing has been used in racing for many years.
Next, you can have occasional detonation (spark nock) caused by oil vapor or droplets of oil being ingested by your engine from the PVC system regardless of any grade of gas. In Chrysler products, they use a PVC pullover device that sometimes sheds oil, which has a very low in octane rating, which will dilute the gas octane rating causing this occasional spark nock.
To prevent or greatly reduce this occasional spark nock, all you have to do is add a oil separator catch can which prevents most of the oil vapor or droplets from entering your engine. You can make a catch can or use a commercially available separator commonly found on air compressors used to keep the oil out of your paint guns. It also works fairly well.
This will help prevent any spark retard caused by your nock sensor sensing detonation.
I use 87 octane in my Chrysler 300C as well as my Grand Cherokee Limited, both with the 5.7L MDS engine, and have NEVER had any problem whatsoever. No knocking, no lag, nuthin'! I don't get on it very much, but when I do, it still feels like a kick in the pants on acceleration. NO REGRETS!
Just my 2 cents worth!
You can use 87 gas during the winter months as colder engine temps require less octane. In the summer you need the 89 gas unless you have a 180 thermostat and fan mods.In warm weather coolng temps reach 219F in slow traffic without mods causing engine ping on 87 gas. Even if you dont always hear it (radio playing,exhaust sound )it is happening and engine ping will cause damage that costs far more than the 15 cents a gallon more for 89 gas. Most common damage is blown head gaskets(iron block +aluminum heads)which go bad due to ping vibration
ricardo, I think something else was going on with your vehicle. 87 should be just fine....maybe the gas cap wasn't tight?????
i did not notice any problems with the cap. the engine light was the sign the experiment is to come to the end. strange timing even if it is just a coincidence.
i am using only 89 now. in almost 3 years i had the car, i never had problem with the light, but on the occasion i tried to use 87.
Not in Nebraska. But I have seen it in a Wall Mart, SW of Des Moines, near Pella, Iowa. I was surprised too, since I only saw it in Utah and Colorado before. Fuels avaiable were 89,87 and 85 octane. Of course the low price for the 85 octane is what made me stop there for gas. Bait and switch.
HKS
Hey, just FYI a bunch of us LX folks are starting to plan some local meet&Greets....how can we contact you?? That is if you are interested. Also there is a local SRT website based out of Lincoln ( you don't have to have an SRT to join) PM me and I will pass the info along
bob
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