91 Octane - Chevy Malibu Forum: Chevrolet Malibu Forums
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post #1 of 26 (permalink) Old 04-14-2019, 06:19 AM Thread Starter
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91 Octane

Hi. I read that the 2018 2.0 needs 93 Octane. Well that is not available in North Dakota so how screwed am I for engine issues down the road? We only got 91.
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post #2 of 26 (permalink) Old 04-14-2019, 06:56 AM
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I think with 91 you will be fine with expected performance. 93 is "strongly recommended", not required. If you have knock, you might want to see the dealer or trade it in if no 93 is available anywhere. In Michigan where I am our min standard for premium is 90 but we have 92 and 93 almost everywhere. Here is the quote from the user manual for other owners that read this thread (Pg. 263):

"For vehicles with the 2.0L L4 engine, premium unleaded gasoline meeting ASTM specification D4814 with a posted octane rating of 93 is highly recommended for best performance and fuel economy. Unleaded gasoline with an octane rated as low as 87 can be used. Using unleaded gasoline rated below 93 octane, however, will lead to reduced acceleration and fuel economy. If knocking occurs, use a gasoline rated at 93 octane as soon as possible, otherwise, the engine could be damaged."
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post #3 of 26 (permalink) Old 04-14-2019, 07:08 AM
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Re: 91 Octane

I’ve been using 91, which is what 95% of premium is around this area as well, for almost 47K miles without an issue.

You’re fine.
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post #4 of 26 (permalink) Old 04-14-2019, 10:37 AM Thread Starter
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Re: 91 Octane

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Originally Posted by miweber929 View Post
Iíve been using 91, which is what 95% of premium is around thus area as well, for almost 47K miles without an issue.

Youíre fine.
Good to know. With 47K and no issues, do you ever put the pedal to the floor? I normally don't but sometimes I get the urge.
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post #5 of 26 (permalink) Old 04-14-2019, 02:59 PM
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Re: 91 Octane

In my 2019 2.0 Equinox Redline, I use both 91 and 93 octane fuels. The 91 is from a BP, Phillips, or Cenex, and is a no ethanol fuel. The 93 octane is from another local BP station, but this one is E-10, 10% ethanol blend.

In colder weather I tend to prefer the 91 no ethanol; when ambient temps are higher and I am using AC and traveling higher speeds under higher loads, I prefer the 93 octane for maximum performance and engine protection.

In our Malibu 1.5 we use 87 or 89 E-10.
.
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post #6 of 26 (permalink) Old 04-14-2019, 06:28 PM
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Re: 91 Octane

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Good to know. With 47K and no issues, do you ever put the pedal to the floor? I normally don't but sometimes I get the urge.
Iím not sure exactly what youíre asking. Iíve been known to punch it when Iím passing someone or if I need to merge into traffic quickly but the days of flooring it at every stoplight, racing, trying to be the fastest car on the road or finding top speed are long over for me. I did specifically buy the 2.0 because I like the style of the car, the 1.5l is anemic and Iím not usually a huge fan of 4 cylinders in general but the 2.0 turbo makes the car fun to drive.

And I have several two wheel vehicles that do a much better job of causing trouble if the urge to be bad strikes.

I donít baby it, however, if thatís what youíre asking.
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post #7 of 26 (permalink) Old 04-14-2019, 06:40 PM Thread Starter
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Re: 91 Octane

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Originally Posted by miweber929 View Post

I donít baby it, however, if thatís what youíre asking.
Exactly what I was wondering. Thank you.
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post #8 of 26 (permalink) Old 04-15-2019, 12:16 PM
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Re: 91 Octane

All we have out here in Cali is 91 ??? it's all i run in my 17 Regal GS 2.0T and have had no problems, lot of get up and go.
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post #9 of 26 (permalink) Old 04-17-2019, 06:32 AM
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Re: 91 Octane

I had an Audi that needed premium. Sure it was fun to drive, but with our Malibu Hybrid I don't miss that (here in WI) 20% premium......on premium......

Last edited by Tool Belt; 04-17-2019 at 11:52 AM.
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post #10 of 26 (permalink) Old 04-18-2019, 03:16 AM
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Re: 91 Octane

I wonder what changed between 2013 (91 or higher) to 2018 (...93 is highly recommended)...very grateful that a couple members of this Forum way back when got my attention to this early on...

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