Quick answer
Mercedes-Benz coolant: Mercedes approves coolants by MB sheet number. MB 325.0/326.0 apply to cars built up to April 2014, and MB 325.6/326.6 to all vehicles including later ones. Mercedes says not to mix specs. Check the approved-products list on its Operating Fluids site.
Mercedes-Benz coolant at a glance
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On this page
What coolant does Mercedes-Benz use?
- Mercedes-Benz publishes its approved coolants in its Operating Fluids specifications (BeVo). Sheet 310.1 covers coolants. [1]
- Per MB sheet 310.1 (we read a copy posted on an owners' forum, because Mercedes' own site needs JavaScript), MB 325.0 (concentrate) / 326.0 (ready-mix) apply to passenger cars built up to April 2014, while MB 325.6 / 326.6 can be used for all vehicles, including those from 2014 on. Mercedes-Benz says not to mix different MB coolant specifications. [2]
- The sheet calls for about 50% antifreeze and 50% water, with a maximum of 55% antifreeze. [2]
How Mercedes-Benz coolant changed over the years
Mercedes-Benz approves coolants by sheet number in its Operating Fluids (BeVo) system rather than by naming one bottle [1]. Approved products are listed on the sheet for each specification [3] [4].
Built up to April 2014
MB 325.0 (concentrate) / 326.0 (ready-mix) Not stated
Per sheet 310.1 [2]
All vehicles, including 2014 on
MB 325.6 / 326.6 Not stated
Mercedes-Benz coolant chemistry
The 325 sheets cover concentrate, and the matching 326 sheets cover ready-mix [2]. Mercedes asks for about 50% antifreeze, and no more than 55% [2].
Known Mercedes-Benz coolant issues
- Mercedes-Benz says not to mix different MB coolant specifications [2].
- Our main copy of sheet 310.1 comes from an owners' forum because Mercedes' own site needs JavaScript [2]. Check the live BeVo pages before relying on it.
Aftermarket coolants listing a Mercedes-Benz code
12 products in our data list one of these codes, per their maker:
Codes these products list (tap for every match)MB 325.0 3MB 325.6 3MB 325.3 3MB 325.5 3MB 326.6 2MB 326.0 1MB 326.5 1
Plus 2 more in the finder.
Coolants whose maker mentions Mercedes-Benz
9 more only mention Mercedes-Benz in application text, which is weaker than a code:
Plus 3 more in the finder.
Other car makes
Other car makes
A Mercedes-Benz spec does not carry over to other brands. Also have a car from BMW or Volvo? Look up Audi and Tesla too, and read can you mix coolant? before sharing one bottle. All makes: coolant by car make.
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Our best coolant for Mercedes-Benz page puts the genuine coolant and the aftermarket products that list a matching code side by side, with buying links. It is not a test or ranking.
Frequently asked questions
What does MB 325.6 mean?
It is a Mercedes-Benz coolant concentrate approval that can be used for all vehicles, including those built from 2014.
What is the difference between MB 325 and MB 326?
325.x sheets cover concentrate and 326.x sheets cover ready-mixed coolant.
How strong should Mercedes coolant be?
About 50/50, and no more than 55% antifreeze, per sheet 310.1.
Is Coolant.com affiliated with Mercedes-Benz?
No. We are independent of Mercedes-Benz.
Mercedes-Benz coolant part numbers and spec codes
Below: the numbers printed on the Mercedes-Benz parts listings we cite. Treat them as search terms and check them against your manual.
Repair manuals & accessories
Repair manual for your car
Haynes repair manual for Mercedes-Benz
Step-by-step procedures, including draining, refilling and bleeding the cooling system. Manuals cover specific models and years: check the coverage on the cover before you buy.
Examples of the tool type, not a test or ranking by us. Check fit and instructions before you buy. See the full cooling system tools guide.
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How we source this page
- Facts come from manufacturer pages, datasheets, owner's manuals and standards bodies, linked under Sources.
- We do not test products, and no brand pays to be listed or ranked. Advertising and affiliate links are labelled and never change the data.
- Anything we could not find is marked "not published" rather than guessed. Spotted an error? Tell us.