GLS Class (X166) Produced from 2016 to 2019

E85

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Old Apr 28, 2021 | 03:06 PM
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2005 E500, 2017 GLS550
E85

Anyone running E85 (with a proper tune of course)? Curious how it worked for you and if you liked it... E85 is plentiful around here in MI and the cost is much less than 93 octane plus there's the performance side.

2017 GLS550
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Old May 3, 2021 | 09:41 AM
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2008 GL320CDI (310k), 2017 GLS450 (170k), 2024 Sprinter 2500 (40k)
Do you know if the fuel system of GLS can support E85? I've been running this fuel for many years in my almost 30yo hobby vehicle, with upgraded fuel pump and lines. E85 is a great race gas replacement.
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Old May 3, 2021 | 01:41 PM
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2005 E500, 2017 GLS550
Flex-Fuel Tune

Originally Posted by a2j
Do you know if the fuel system of GLS can support E85? I've been running this fuel for many years in my almost 30yo hobby vehicle, with upgraded fuel pump and lines. E85 is a great race gas replacement.
I guess I should have worded that better. I can get a tune that runs 50% E85 and 50% 93 octane blend. To my knowledge The GLS does not support full E85.
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