Keeping your Mercedes ML350 running cool is key to its health and long life.
>The wrong coolant can cause big problems over time. You need a product that meets the strict specs for your engine.
We looked at the top options you can buy right now. This includes the actual coolant, reservoirs, and even a new radiator.
Our guide helps you pick the right part for your needs and budget. Let’s find the best cooling solution for your ML350.
| Product Image | Product Name | Best For | Check Price |
|---|---|---|---|
 |
Mercedes-Benz Windshield Washer Fluid | Windshield Care | PRICES |
 |
Genuine Mercedes Coolant | OEM Coolant | PRICES |
 |
Coolant Reservoir for W164 | W164 Reservoir | PRICES |
 |
Oulesh Reservoir for W163 | W163 Reservoir | PRICES |
 |
Oulesh Expansion Tank | W163 Expansion Tank | PRICES |
 |
ZHENSIW Expansion Reservoir | W251 Models | PRICES |
 |
OXPUPMB Radiator | Full Radiator | PRICES |
Mercedes-Benz Windshield Washer Fluid
This is the official washer fluid from Mercedes-Benz for clear vision in cold weather.
It is a concentrate that you mix with water. The formula works well to prevent freezing on your windshield.
Using the right fluid helps keep your washer system clean. It stops clogs that can happen with cheap products.
Pros:
👍 Genuine Mercedes-Benz product
👍 Prevents freezing in cold temps
👍 Concentrate offers good value
👍 Helps keep nozzles clean
👍 Easy to mix and use
Cons:
👎 Not a coolant product
👎 Higher cost than store brands
👎 Only for washer system
My Honest Opinion:
This is a great fluid if you want the real deal for your washer tank. It’s not a coolant, but it’s vital for winter driving. I’d buy it to keep my car’s systems happy.
Genuine Mercedes Coolant
This is the factory-approved coolant for your Mercedes ML350.
It meets all the specs to protect your engine from freezing and overheating. The formula also fights rust and scale inside the cooling system.
Using the right coolant prevents damage to seals and parts. It is a safe bet for a top-off or a full change.
Pros:
👍 Official OEM coolant
👍 Prevents corrosion and scale
👍 Correct formula for your engine
👍 Protects aluminum parts
👍 Ready-to-use format
Cons:
👎 More costly than generic brands
👎 You might need several bottles
👎 Not a concentrate
My Honest Opinion:
Don’t risk your engine with a cheap coolant. This is the one Mercedes designed for your car. The peace of mind is worth the extra few dollars for sure.
Coolant Reservoir for W164
This is a replacement coolant tank for the W164 generation ML350.
It comes with a built-in level sensor to warn you if the coolant is low. The plastic construction is strong and made to last.
Be aware that a cap is not included with this tank. You will need to reuse your old one or buy it separately.
Pros:
👍 Direct fit for W164 models
👍 Includes level sensor
👍 Durable plastic build
👍 Easy installation process
👍 Good price for an essential part
Cons:
👎 Reservoir cap is not included
👎 Aftermarket part, not OEM
👎 Sensor quality is unknown
My Honest Opinion:
If your old tank is cracked or leaking, this is a solid fix. Just remember to keep your cap. The included sensor is a nice bonus for a fair price.
Oulesh Reservoir for W163
This Oulesh tank is made for the first-generation W163 ML350.
The best part is that it comes with a brand new cap. You won’t have to worry about reusing an old, worn-out one.
It fits several models like the ML320, ML430, and ML500. The black plastic looks just like the original part.
Pros:
👍 Includes a new reservoir cap
👍 Fits W163 ML models perfectly
👍 Complete set, ready to install
👍 Good build quality for the cost
👍 Clear level markings
Cons:
👎 Not a genuine Mercedes part
👎 Long-term durability is a question
👎 No level sensor included
My Honest Opinion:
This is a great deal for W163 owners. Getting the tank and cap together saves you time and hassle. It’s a simple swap that fixes a common leak point.
Oulesh Expansion Tank
Here is another reservoir option for your W163 SUV from Oulesh.
It serves as the expansion tank for the cooling system. This part handles the coolant as it heats up and expands.
The fit is designed to be exact for a simple installation. It is a direct replacement for the OEM part number.
Pros:
👍 Direct OEM replacement
👍 Simple bolt-on installation
👍 Handles coolant expansion
👍 Affordable solution
👍 Good for older W163 models
Cons:
👎 Brand reputation is not well known
👎 Plastic quality may vary
👎 Check if cap is included
My Honest Opinion:
If your expansion tank is yellowed or cracked, this will do the job. It’s a basic, no-frills part that gets you back on the road. The price is right for an older car.
ZHENSIW Expansion Reservoir
This reservoir is meant for Mercedes models using the W251 platform.
That includes the R-Class, not the ML350. It is crucial to check your car’s fitment before you buy this part.
The quality seems decent for an aftermarket option. It replaces a common OEM part number for those specific vehicles.
Pros:
👍 Fits W251 platform vehicles
👍 Direct replacement part
👍 Appears to be well-made
👍 Solves leaks on compatible models
👍 Cost-effective
Cons:
👎 DOES NOT fit ML350 models
👎 Brand is not well known
👎 Verify your car’s model year
My Honest Opinion:
Be careful with this one. It’s a good part, but only if you have an R-Class. Double-check your car’s info so you don’t order the wrong tank.
OXPUPMB Radiator
This is a full radiator replacement for a wide range of Mercedes models, including the ML350.
It is a major cooling component, not just a tank. You would install this if your original radiator is damaged or clogged.
The fitment covers many years and engine types. Be sure to confirm it matches your specific ML350 model year.
Pros:
👍 Full radiator assembly
👍 Fits many Mercedes SUVs
👍 Solves major cooling issues
👍 All-metal construction
👍 Complete replacement
Cons:
👎 Complex installation for most people
👎 Aftermarket brand quality
👎 Must check exact fitment
My Honest Opinion:
This is a big job, but this radiator is a good option if yours is shot. I’d recommend it for a DIYer with some skills or for a shop to install.
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