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2013 350 Bluetec - need to top up coolant. Do I need special coolant?

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Old 07-23-2018, 09:28 AM
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W166 ML350 Blutech
2013 350 Bluetec - need to top up coolant. Do I need special coolant?
Got a low coolant light on. Do I need to get special coolant for the W166 diesel? or is coolant coolant?
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Old 07-23-2018, 07:46 PM
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I did a bit of research and it seems that MB sensors insist on genuine MB coolant.
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Old 07-24-2018, 08:26 PM
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When my low coolant light came on it was only very slightly low. Added a 1/4 cup or so of distilled water and it has been fine since.
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Old 07-24-2018, 08:37 PM
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You can top off with pure water, and it should be fine. If not, yes try to get the correct blue or red OEM coolant. Most generic coolants at auto parts stores are safe to mix, the MB stuff isn't corrosive, but still it's not worth having an issue due to wrong coolant compounds. Safer to add just water and dilute it a tiny bit than run it low, and it can't hurt anything.
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Old 07-25-2018, 09:01 AM
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Most MB Dealers will top off a small coolant loss at no charge. The low cooland sensor is very very sensitive to even a tiny drop in level.
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