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2018 GLS63 Coolant Question.

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Old Nov 4, 2023 | 09:18 PM
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2018 Mercedes GLS63 AMG
2018 GLS63 Coolant Question.
Hey all, could I use Zerex G40 coolant that is same spec as Mercedes coolant to top off coolant level?
Would I need to flush out the system if adding a different coolant other than Mercedes coolant that is in it currently?
If not can I just add distilled water to top off coolant level?

…..or safer to just go to Mercedes and buy Mercedes specific coolant ?

thank you!
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Old Nov 6, 2023 | 06:36 PM
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E55, GLS450, GL63, GLE350
I add distilled water.
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