M-Class (W166) Produced 2012-2015

93 octane

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Old Mar 23, 2017 | 05:17 PM
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easyedwin's Avatar
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From: Birmingham
GLE 350 4matic-Porsche Cayman
93 octane

I have been pumping 93 octane into my ML 350 since last year. I do this because the only choice at the pumps is 89 octane or 93 octane.
Is this beneficial ?
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Old Mar 23, 2017 | 05:27 PM
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From: Springboro, OH
16 GLC 19 Volvo XC40 06Corvette Z06
The manual specifies 91 octane. If not available seems the logical decision would be to use 93.

91 difficult to find where I live.
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Old Mar 23, 2017 | 05:51 PM
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pcy
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'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
If you only have choice of 89 and 93. Then the decision is clear... 93.
No significant/measurable benefit for using 93 vs. 91 octane gas.

If I were you, I'd pay more attention to oil change interval, type of oil used for oil changes, proper tire pressure in the tires, etc.
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Old Mar 23, 2017 | 08:20 PM
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I used 89 all the time.
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Old Mar 23, 2017 | 09:16 PM
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GLE350d, Porsche TE
If you don't put your foot into it 89 will work fine. But higher than specified octane does not provide any benefit.

Last edited by nookie; Mar 24, 2017 at 07:45 AM.
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