The 2015 GLA 250 requires a Mercedes-Benz approved long‑life coolant that meets MB specification MB 326.0 (the successor to the older MB 236.x family). Use Genuine Mercedes-Benz coolant or an aftermarket product explicitly labeled MB 326.0, and avoid mixing different coolant types.
In detail, the GLA 250’s cooling system is designed for an ethylene glycol–based coolant with organic acid technology (OAT), formulated to resist corrosion in aluminum engines and to provide extended service intervals. Always verify the exact MB specification in the owner’s manual and ensure any replacement coolant is compatible with aluminum components and the vehicle’s sealed system.
Coolant specifications for the 2015 GLA 250
To help you shop for the right product, here are the key compatibility criteria you should verify on any coolant you consider.
- Meets Mercedes-Benz specification MB 326.0 (the modern standard for this generation).
- Ethylene glycol–based formulation for effective freezing protection and heat transfer.
- Silicate-free and phosphate-free to avoid damaging aluminum components and seals.
- Organic acid technology (OAT) or hybrid OAT (HOAT) chemistry for long-life protection.
- Approved for aluminum engine components and compatible cooling system materials.
- Available as ready-to-use/pre-diluted 50/50 mix or as concentrate (to be mixed with distilled water as directed).
Bottom line: Choose an MB-approved coolant labeled MB 326.0 or Genuine MB coolant, and avoid non‑MB products to protect the cooling system and warranty.
Maintenance and replacement tips
Here are practical steps for checking, topping off, or replacing coolant in the GLA 250.
- Consult the owner’s manual to confirm the exact MB specification and service interval for coolant replacement.
- Decide whether you need pre-mixed 50/50 coolant or concentrate that you dilute with distilled water.
- Use distilled water if you’re mixing concentrates; never use tap water, which can introduce minerals.
- Ensure the engine is cool before opening the cooling system cap to avoid scalding or pressure release hazards.
- Bleed air from the system if your vehicle requires it, and fill to the correct level on the reservoir mark (MAX line).
- Replace at the intervals recommended by Mercedes-Benz or your dealer; long-life MB coolants are designed for extended service but should be refreshed per the manufacturer’s schedule.
Consult a qualified technician if you’re unsure about the exact MB specification or the bleeding procedure for your model year.
Where to buy MB-approved coolant
You can purchase MB-approved coolant (MB 326.0) at Mercedes-Benz dealerships, authorized service centers, or reputable auto parts retailers. Look for bottles labeled for MB 326.0 compatibility to ensure you’re using the correct formulation.
Summary
For a 2015 Mercedes GLA 250, use a long-life, ethylene glycol–based coolant that meets Mercedes-Benz specification MB 326.0 (the MB 236.x family’s successor). Choose Genuine MB coolant or an aftermarket product clearly labeled MB 326.0, keep to a 50/50 mix if using concentrate, avoid mixing different coolant types, and follow the vehicle’s service intervals. Proper selection and careful maintenance protect the engine, preserve coolant system integrity, and support long-term reliability.