What coolant does the 2015-2021 Mercedes-Benz C-Class take?

The 2015-2021 Mercedes-Benz C-Class takes MB 325.6 (Si-OAT, pink). The cooling system holds about 7.9 quarts. This is the spec from the owner's manual, which is the final word.

How much coolant does the 2015-2021 Mercedes-Benz C-Class hold?

The 2015-2021 Mercedes-Benz C-Class cooling system holds about 7.9 quarts for a full drain and fill. For a top-off you only add what's low, mixed 50/50 with distilled water unless you're using a pre-diluted coolant.

2015-2021 Mercedes-Benz C-Class coolant type & capacity

The exact coolant your C-Class takes, the color, how much the system holds, and when to change it. The coolant type is straight from the owner's manual — the real authority — so you buy the right jug the first time.

Affiliate disclosure: CarCareTruth is reader-supported. As an Amazon Associate I earn from qualifying purchases. We may also earn commissions from other retailers linked on this page, at no extra cost to you. Affiliate revenue never influences our scores or rankings. Full disclosure

Coolant type

MB 325.6 (Si-OAT, pink)

Si-OATpink

From the owner's manual. The coolant type is a single-source spec — your owner's manual or the OEM parts catalog is the authority, and it's the final word.

System capacity

7.9 qt

Manufacturer figure

We don't stock a reviewed coolant matched to this car yet. Search the coolant type on Amazon — and double-check the OEM spec on the bottle against your manual before you buy.

Find the right coolant on Amazon

Where this came from

Mercedes-Benz C-Class (W205) 2015-2021 Owner's Manual — Coolant / Operating fluids — source
FCP Euro — Choosing the Proper Engine Coolant for Your Mercedes — source
AutohausAZ — Mercedes C300 Coolant Replacement — source

The coolant type is a single-source spec from the owner's manual or OEM parts catalog — we never dress that up as cross-checked against two sources, because it isn't. The system capacity carries our verified badge only when two independent sources agree on it. Coolant color is a rough hint at chemistry, not a guarantee — match the spec, not the color, and never mix families. Your owner's manual is always the final word.