What Type of Coolant Does a BMW 328i Take?

A BMW 328i typically requires a phosphate- and nitrite-free, ethylene glycol–based HOAT (Hybrid Organic Acid Technology) coolant that meets BMW specification “BMW N 600 69.0” or is labeled as BMW-approved (often blue in color). In practical terms, owners should use genuine BMW coolant or a high-quality compatible European formula that explicitly states BMW approval, mixed 50/50 with distilled water.

Understanding the BMW 328i and Its Coolant Requirements

The BMW 328i, across its various generations, uses an aluminum-intensive engine and cooling system that is sensitive to coolant chemistry. Using the correct coolant is critical for preventing corrosion, overheating, and premature failure of water pumps, radiators, and other cooling components. While the exact formulation has evolved, BMW has consistently required a specific type of HOAT coolant that is different from many generic green or “universal” coolants sold in parts stores.

The Official Coolant Specification for the BMW 328i

BMW does not simply recommend “any coolant” for the 328i. Instead, the automaker defines a detailed specification to protect the engine and cooling system over the long term. Understanding this specification helps owners avoid incompatible products.

BMW Specification and Standard

The coolant for a BMW 328i must meet a formal internal standard, which coolant manufacturers can test and certify against. This standard governs corrosion protection, compatibility with seals and metals, and long-term stability.

The main BMW coolant requirements are:

• Must meet BMW standard BMW N 600 69.0 (or stated as BMW-approved on the label).
• Phosphate-free and nitrite-free, to protect aluminum and modern cooling components.
• HOAT (Hybrid Organic Acid Technology) ethylene glycol–based coolant.
• Typically blue in color for genuine BMW coolant (but color alone is not a guarantee).
• Concentrate designed to be mixed with distilled water, usually at a 50/50 ratio.

Together, these requirements mean that not all off-the-shelf coolants are suitable; the product must explicitly indicate compatibility with BMW specifications and use the correct inhibitor package suited for European aluminum engines.

Genuine BMW Coolant vs. Aftermarket Options

Drivers often ask whether they must use “genuine” BMW-branded coolant or if high-quality aftermarket products are acceptable. Both are possible, but there are important caveats.

There are two main categories of coolants commonly used in BMW 328i models:

• Genuine BMW Coolant (OEM): Sold at BMW dealerships and many European specialty shops; blue; designed specifically to match BMW’s latest standard.
• BMW-approved aftermarket coolant: European-formula HOAT or sometimes “Si-OAT” coolants from brands such as Pentosin, Zerex, or Febi that state “meets BMW specifications” or list BMW on their approval list.

While genuine BMW coolant removes any doubt about compatibility, reputable aftermarket coolants with explicit BMW approval are widely used by independent shops and enthusiasts, particularly for older 328i models where cost and availability are more significant factors.

Coolant Types by BMW 328i Generation

Although BMW has refined its formulas across generations, 328i models—from the E36 to the F30—generally share similar coolant needs. The specifics can differ slightly based on model year and regional availability, but the underlying chemistry requirements remain consistent.

E36 328i (mid-1990s)

The E36 328i, sold primarily in the mid to late 1990s, uses a cast-iron block with an aluminum head but still demands a European-style, phosphate-free coolant to prevent scaling and corrosion.

Key points for E36 coolant:

• Use a phosphate-free, nitrite-free, ethylene glycol HOAT coolant.
• Genuine BMW blue coolant is fully compatible and recommended.
• A 50/50 mix with distilled water is typical for temperate climates.
• Avoid old-style “green” IAT coolants common in older domestic vehicles.

For these older models, sticking to a BMW-approved coolant helps prevent internal corrosion and protects plastic components that are already prone to aging and failure.

E46 328i (late 1990s–early 2000s, where applicable)

The E46 3 Series lineup in some markets included engines equivalent to the 328i/330i range. These engines rely heavily on plastic cooling components and aluminum parts, making coolant chemistry especially important.

E46-related coolant considerations include:

• Use coolant that explicitly meets BMW’s standard for aluminum engines.
• Again, genuine BMW blue coolant or an approved HOAT coolant is recommended.
• A 50/50 coolant-to-distilled-water mix remains the standard.
• A full system flush is advised if any unknown or incompatible coolant has been used previously.

With the E46’s known vulnerability to cracked expansion tanks and plastic fittings, maintaining proper coolant type and mixture helps reduce stress and failure rates, particularly as the car ages.

E90/E92 328i (mid-2000s to early 2010s)

The E90-generation 328i, using engines such as the N52, features extensive aluminum construction and sensitive electric thermostats and water pumps. This era solidified BMW’s use of its recognizable blue coolant.

For E90/E92 328i models:

• Use BMW blue ethylene glycol HOAT coolant, BMW-approved or genuine.
• Mix 50/50 with distilled water, unless extreme climates justify a slightly different ratio.
• Avoid “universal” or silicate-heavy coolants, which can damage seals and clog passages.
• Regularly check coolant concentration and condition, especially around 60,000–80,000 miles.

Because electric water pumps in these cars can be costly to replace, keeping the correct coolant mixture and chemistry is a relatively inexpensive way to extend component life and maintain stable operating temperatures.

F30 328i (early to mid-2010s)

The F30 328i, often equipped with the turbocharged N20 engine, places even more demand on the cooling system due to higher thermal loads and integrated turbocharging. Coolant specification becomes crucial for both performance and reliability.

Coolant considerations for the F30 328i include:

• Use BMW-approved blue coolant that meets the latest BMW N 600 69.0 standard.
• Stick to a 50/50 mix of coolant and distilled water unless the owner’s manual specifies otherwise for extreme temperatures.
• Never mix DEX-COOL–type orange coolant or generic “long-life” coolant unless explicitly labeled as BMW-compatible.
• Observe service recommendations; some dealers treat coolant as “lifetime,” but many specialists advise periodic replacement, especially in harsh climates.

With turbocharged engines and tighter cooling margins, proper coolant type and mixture on the F30 328i help reduce risks of overheating, turbo damage, and internal corrosion, particularly as the vehicle accumulates mileage.

Mixing Ratios and Climate Considerations

Choosing the correct coolant is only half the task; mixing it properly with water is equally important. Concentrate must be diluted correctly to balance freeze protection, boil protection, and corrosion resistance.

Standard Mix: 50/50 Coolant and Distilled Water

For most BMW 328i owners, BMW and experienced technicians recommend a 50/50 mix of coolant concentrate with distilled water. This blend offers a solid compromise between protection and performance in a wide range of climates.

Main aspects of the standard mixture:

• Freeze protection: Generally protects down to around -34°F (-37°C), suitable for most winter conditions.
• Boil protection: Raises boiling point above that of plain water, especially under system pressure.
• Corrosion resistance: Ensures adequate inhibitor concentration to protect metal and plastic components.
• Compatibility: Matches what BMW calibrates its systems around for normal use.

By sticking close to 50/50, owners reduce the risk of weak corrosion protection from over-dilution or poor heat transfer from using too much concentrate.

Extreme Climate Adjustments

In particularly harsh climates, minor deviations from the standard ratio can be considered, but within limits. Both BMW and coolant manufacturers warn that more coolant does not automatically mean better protection.

When adjusting for climate, typical guidance includes:

• Colder climates may use up to about 60% coolant and 40% water for added freeze protection.
• Concentrations above about 65% coolant can reduce cooling efficiency and are not advised.
• Warmer regions may use slightly more water (e.g., 55% water / 45% coolant) for marginally better heat transfer, but this must maintain adequate corrosion protection.
• Always use distilled or demineralized water to avoid mineral buildup and scaling.

The goal is to preserve the protective chemistry while adapting modestly to local weather, rather than making extreme changes that compromise engine safety.

What Not to Use in a BMW 328i Cooling System

Misuse of coolant—whether through the wrong type or mixing incompatible products—is one of the most common and costly mistakes seen in BMW cooling systems. Several popular coolant types should be avoided unless you can confirm BMW compatibility on the label.

Commonly Misused Coolant Types

Many coolants are designed with different manufacturers and materials in mind. BMW’s system chemistry is not interchangeable with all of them.

Coolant types that should generally be avoided in a BMW 328i include:

• Generic “green” IAT coolant: Traditional North American formulas for older domestic vehicles; generally not compatible with BMW’s requirements.
• DEX-COOL (orange) OAT coolant: GM’s long-life coolant; not formulated for BMW’s specifications and can cause compatibility issues.
• “Universal” all-makes, all-models coolants: Often rely on broad marketing claims rather than precise European approvals; many lack BMW certification.
• Silicate-heavy Asian coolants (often blue or pink): Tuned for Japanese/Korean systems; color similarity to BMW coolant is coincidental and not a guarantee of suitability.

Choosing any of these without explicit BMW approval on the packaging risks accelerated corrosion, deposits, or seal wear—effects that may only become apparent years later, when failures become expensive.

Risks of Mixing Different Coolant Types

Even if each individual coolant type is safe in its intended system, mixing them can lead to undesirable chemical interactions. This is particularly true when combining European HOAT coolants with North American OAT or IAT products.

Major risks of mixing incompatible coolants include:

• Gelling or sludge formation: Mixed additives can precipitate, clogging radiators, heater cores, and narrow passages.
• Reduced corrosion protection: Inhibitor packages can neutralize one another, leaving metal surfaces vulnerable.
• Degraded plastic and rubber components: Seals, hoses, and expansion tanks may harden, crack, or swell prematurely.
• Unpredictable service life: The resulting blend may not last its intended interval, necessitating earlier replacement.

When in doubt about what is currently in the system, a complete flush and refill with the correct BMW-approved coolant is safer than topping off with an unknown or incompatible product.

How to Confirm the Correct Coolant for Your Specific 328i

While general guidelines apply to all 328i models, the most accurate information will always come from model- and market-specific documentation. Because formulations and part numbers can change, verification is important.

Sources of Reliable Information

Owners have several reliable ways to check exactly which coolant their BMW 328i should use, even as specifications evolve over time.

Recommended ways to confirm the correct coolant include:

• Owner’s manual: Check the “Engine Coolant” or “Technical Data” section for coolant type and mix ratios.
• BMW dealer or authorized service center: Provide your VIN and ask for the current recommended coolant part number.
• Official BMW technical documents: Service bulletins and technical literature may specify updated standards or formulations.
• Reputable European parts suppliers: Many list coolants by BMW model and engine code and specify which products meet BMW standards.

These sources help ensure you are not relying on generic or outdated advice, especially important for newer models or in regions where multiple coolant products are sold under similar branding.

Summary

The BMW 328i—across its various generations—requires a specific type of coolant: a phosphate- and nitrite-free, ethylene glycol–based HOAT coolant that meets BMW specification BMW N 600 69.0, most commonly supplied as the familiar blue “BMW coolant.” Owners can safely use genuine BMW coolant or a reputable European-formula coolant that explicitly lists BMW approval on the label, always mixed with distilled water at roughly a 50/50 ratio for everyday climates.

Avoid generic green, orange DEX-COOL, or “universal” coolants unless they clearly state BMW compatibility, and never mix incompatible coolant types. When in doubt about what is in the system, perform a full flush and refill with the correct product. By following BMW’s coolant specifications and respecting proper mixing ratios, 328i owners can protect their engines, water pumps, and radiators, preserving both performance and long-term reliability.

What kind of coolant does a 2007 BMW 328i take?

The correct antifreeze for a 2007 BMW 328i is a blue, phosphate- and nitrite-free coolant that follows the G48 formula. You can use Genuine BMW blue coolant or a compatible European-spec antifreeze concentrate, which should be mixed with distilled water at a 1:1 ratio for best performance. A premixed 50/50 option is also available, such as the OEM by Prestone BMW Blue. 
Coolant recommendations

• Genuine BMW Blue Coolant: This is the factory-approved coolant and is part number 82-14-1-467-704. 
• Zerex G-48: This is an OEM-approved alternative that is specifically designed for this type of BMW. 
• Prestone BMW Blue 50/50 Premixed: This is a ready-to-use option that already has the correct mixture of coolant and distilled water. 
• PEAK Original Equipment Technology European Vehicles Blue Concentrate: This is another compatible concentrate that can be mixed with distilled water. 

Important considerations

• Mix with distilled water: If you buy a concentrate, always mix it with distilled water. Do not use tap water. 
• Avoid universal coolants: Off-the-shelf universal coolants are not recommended and can cause issues in BMW cooling systems. 
• Do not mix different coolants: Avoid mixing different coolant formulas to prevent compatibility problems. 
• HT-12 coolant: Do not mix this blue G48 formula with the newer HT-12 coolant, which is used in some newer BMW models. 

What kind of coolant does a 2013 BMW 328i take?

The correct coolant for a 2013 BMW 328i is a blue, G48 type. You can use a genuine BMW blue coolant or an aftermarket G48-spec coolant like Zerex G48. Always ensure that the coolant is mixed with distilled water or purchased as a pre-mixed 50/50 solution, and that it is not mixed with HT-12 coolant.
 
This video explains what type of coolant BMW cars use: 57sBIMMER ZEITYouTube · Oct 27, 2020
Coolant type and specifications

• Coolant type: G48 blue coolant 
• BMW Part Number: You can find compatible BMW parts through dealerships or online retailers. 
• Approved mixture: G48 concentrate must be mixed with distilled water. 
• Compatibility: This coolant is approved for use in all BMW engines but should not be mixed with HT-12 coolant. 

Where to buy

• BMW Dealership: Purchase the genuine BMW blue coolant. 
• Aftermarket retailers: Look for G48-spec coolants from brands like Zerex or Peak. 
• Online parts stores: Websites like Pelican Parts offer compatible options. 

Important considerations

• Avoid mixing: Never mix coolants of different types, especially G48 and HT-12. 
• Use distilled water: If using concentrated coolant, always dilute it with distilled water. 
• Check the color: While color is not always a reliable indicator, the G48 coolant for BMWs is blue. Some aftermarket coolants may have a different color but can still be compatible if they meet the G48 specification. 

What coolant does the BMW 3 series use?

BMW 3 Series engine coolant G12, G11, G13, G12+

Does BMW need special coolant?

Yes, BMWs require a special coolant, typically a blue or purple coolant that is silicate and phosphate-free. Using a generic coolant can lead to corrosion and system damage due to the specific requirements of BMW’s aluminum engine blocks. It’s crucial to use the correct type, which is formulated with organic acid technology (OAT) to provide superior corrosion protection.
 
This video explains why BMW coolant is special and the risks of using generic coolants: 56sBMW DoctorYouTube · Dec 20, 2024
Key requirements for BMW coolant

• Phosphate and silicate-free: Generic coolants often contain silicates and phosphates that can cause corrosion in BMW’s specific aluminum components. 
• Organic Acid Technology (OAT): BMW coolant is formulated with OAT for better protection against corrosion. 
• Correct color: For many models, the correct coolant is blue. Some newer models may use a different color, like purple (HT12), so it is important to verify the exact requirement for your car’s year. 
• Undiluted: BMW’s genuine coolant is sold undiluted and must be mixed with distilled water, typically in a 50/50 ratio, before use. 

You can watch this video to see how to properly mix BMW coolant with distilled water: 54sJustin BuiceYouTube · Apr 29, 2019
What to do if you need to add coolant

• Use the correct type: If you need to top off your coolant, find out what is currently in your system and match it as closely as possible, or use a compatible option like Zerex G48 if the factory fill is unknown. 
• Mix with distilled water: If you are using undiluted coolant, mix it with distilled water in a 50/50 ratio. 
• Check for leaks: If you find yourself frequently adding coolant, there may be a leak in the system that needs to be addressed.