Whats the best octane for a Sky? - Saturn Sky Forums: Saturn Sky Forum
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post #1 of 73 (permalink) Old 09-12-2017, 06:45 PM Thread Starter
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Whats the best octane for a Sky?

I was perusing some of the older posts from the performance part of this forum and ran across one that said to use 93 octane and one that said to use 91 octane. I just use your basic regular gas. Not sure what octane. What is the best for 2.4 base or is it no big deal? Every car I have ever had I just put in the regular, push the button on the extreme left and call it good. Will a higher octane hurt anything? I mean its a Sky. Not that exotic.
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post #2 of 73 (permalink) Old 09-12-2017, 07:03 PM
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Correct, regular Tier One (brand name) gasoline is fine in the 2.4; premium only in the Redline.
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post #3 of 73 (permalink) Old 09-12-2017, 07:05 PM
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There are LOTS of discussions or more likely arguments on this topic! GM recommends 91 for the 2.4L. Why? Because the compression ratio is a bit on the high side at 10.5:1. Using lower octane may result in some pinging and/or reduce mpg's. Pinging can damage the engine over time. If you are at high altitude such as Denver where the air is thinner then a lower octane can be used just fine.

While the engines computer may retard or advance timing to adjust for different octanes, the effect is often lower mpg and lower performance if too low of octane is used.

The Redline 2.0L has a compression ration of 9.2:1. However, being turbo'd the effective compression ratio is much higher. With only 5PSI boost the effective ratio would be 12.33:1.

In my opinion premium should be used for both.

2007 Silver/Red Sky Redline
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post #4 of 73 (permalink) Old 09-12-2017, 07:51 PM
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Originally Posted by Moosebreath View Post
I was perusing some of the older posts from the performance part of this forum and ran across one that said to use 93 octane and one that said to use 91 octane. I just use your basic regular gas. Not sure what octane. What is the best for 2.4 base or is it no big deal? Every car I have ever had I just put in the regular, push the button on the extreme left and call it good. Will a higher octane hurt anything? I mean its a Sky. Not that exotic.
Because you operate your SKY 2.4 at only a few feet above sea level, I would recommend 91 octane as a gesture of love for your car.

Last edited by HORNET1; 09-12-2017 at 08:29 PM.
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post #5 of 73 (permalink) Old 09-12-2017, 08:35 PM Thread Starter
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Ok, now you can put the dunce cap on me and sit me in the corner after this one. 89 vs 91 octane. Is there enough change there to make a difference. Sorry. It's hell being the slow kid in class.
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post #6 of 73 (permalink) Old 09-12-2017, 08:40 PM
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Ok, now you can put the dunce cap on me and sit me in the corner after this one. 89 vs 91 octane. Is there enough change there to make a difference. Sorry. It's hell being the slow kid in class.
I really doubt that you will notice a difference unless you pedal to the metal. However, your car will love you for it if you use 91.

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post #7 of 73 (permalink) Old 09-12-2017, 08:44 PM Thread Starter
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But it's not recommended to go above 91 octane, right?
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post #8 of 73 (permalink) Old 09-12-2017, 08:51 PM
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But it's not recommended to go above 91 octane, right?
93 will certainly not hurt your engine, but in the 2.4, it would be a waste of $$$ in my opinion.
BTW: When are you gonna post some pics of that ride of yours?
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post #9 of 73 (permalink) Old 09-12-2017, 09:07 PM Thread Starter
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Ok, here's my pride and joy and my Sky too.
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post #10 of 73 (permalink) Old 09-12-2017, 09:12 PM
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I love that Pride & Joy pic

That's a very nice looking SKY you have there. I really like the color.
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post #11 of 73 (permalink) Old 09-12-2017, 09:23 PM Thread Starter
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I have loved the design and lines of the Sky since I first saw one years ago and when the bucks and price and color came together last month, I had to have it. I had no clue what to look for and missed some, now, obvious things I should have seen. Nothing major and with the help of the Sky addicts on this forum, I am getting on top of them. Finding and fixing stuff has really helped me learn a lot about this car. I plan to keep her for a long time.
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post #12 of 73 (permalink) Old 09-13-2017, 07:52 AM
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Just as a random thought, why don't you consider following the recommendation in the owners manual?
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post #13 of 73 (permalink) Old 09-13-2017, 08:17 AM Thread Starter
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I have not got there yet. I am learning as I go here and sometimes, I find, there are options you guys employ that are a bit different than what the manual says just thru experience. Just going to the people that know for opinions.
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post #14 of 73 (permalink) Old 09-13-2017, 08:19 AM
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I can't speak for sea level, but at 1000 feet the 2.4 runs exactly the same with all grades of fuel, and the (un-tuned) RL runs the same on 91 as it does at 93.
I did an extensive series of tests using a G-Tech and a DashDAQ and found no difference in performance with the fuels indicated.

The owner's manual recommends a higher grade of fuel than is required in order to provide a buffer in case of extreme conditions.
I think that the consistent use of top-tier fuel is more important than the grade of fuel used, and I use Shell 89 in the 2.4 and 91 in the RL.
This works well for me and I am comfortable with it, but other opinions are certainly just as valid.

John
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Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked
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post #15 of 73 (permalink) Old 09-13-2017, 09:29 AM
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The price of fuel is going up. Notice the difference since Harvey and Imra strolled on through? With the shut down of several refineries in the Gulf, it could be sometime before the prices come down again for the American consumer.

$$$ comes down to what you can afford to put in? Yes I agree with the other owners here, that Top tier fuels Level 1 is the key. IF you can only afford a low tier fuel, non branded then you get what you pay for. You can boost the octane level with additives, but that lasts for a tank full maybe two if your lucky.

It's almost that time of year when the major Oil Co. change over the formula's for the winter season. Well in winter we don't really drive the Kappa, except in some states that don't have a winter.... per say. You can do this too... $10. of 89, $10 of 91 or $10 of 91 & 93 if available in your area?
$ 10 for Fun $20 to Run & $ 40 to fill it give or take but put good quality fuel in it, and your Kappa will thank you in multi versions of the Permagrin mode as possible on the Permagrin scale.. if there is one? Robo will have some sort of table measuring this somewhere.. lol.

I not sure of the previous owner who had my car before, but since I have owned it I have used Shell 93 every time. No worries.. no knock or ping ever.
Price per gal. at last fill up was $3.27 per for 93 at my local station last week? This week... arm and a leg for sure.

LAC
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