G12 coolant runs in most Volkswagen Group vehicles built from the late 1990s through about 2008-2009. You’ll find it spec’d for VW, Audi, Porsche, Bentley, and Bugatti models from that era. The pink or red fluid is built on Organic Acid Technology (OAT), which gives it a longer service life than the conventional green coolants that came before it.
This article reviews some best alternative coolants to replace your G12 from Ravenol (G12++, G13), Valvoline, and Pentosin. Interestingly, these alternatives are more affordable and deliver almost the same benefits as the OEM antifreeze.
G12 Through G12evo
G12 is an older designation but VW updated the formula several times.
G12/G12+/G12++ – Ethylene glycol base with OAT inhibitors. Pink or red color. G12+ improved on the original G12 formula, and G12++ extended service intervals further. These fluids carry VW spec TL774-D (G12), TL774-F (G12+), and TL774-G (G12++).
G13 – VW switched to a glycerin base to make the coolant more environmentally friendly since glycerin biodegrades faster than ethylene glycol. Purple or violet color. The problem is that G13 had issues with buildup and clogging in some cooling systems, particularly when mixed with older fluids or when service intervals were pushed too far.
G12evo – VW went back to ethylene glycol but kept the improved inhibitor package. Pink, fuchsia, or red color depending on the manufacturer. Also sold as HT-12 Pink. This is the current spec that supersedes everything before it.
G13 and G12evo can replace G12, G12+, or G12++ without issues. Running the opposite direction (putting G12 into a system that calls for G13 or G12evo) isn’t recommended because you’re downgrading the protection level.
Related: List of Approved Oils Meeting VW 502 00 Standard
Alternatives to G12 Coolant
G12 uses ethylene glycol as its base. The formula contains no nitrates, amines, phosphates, borates, or silicates. Those additives deplete quickly and can cause problems in aluminum-heavy cooling systems common in European engines.
The OAT inhibitors work differently than conventional coolants. Instead of coating metal surfaces with a protective layer that wears away, OAT inhibitors only activate where corrosion starts to form. This reactive approach means the protection lasts longer before breaking down. Most G12 formulations are based on BASF Glysantin G30 chemistry.
G12 also addresses electrochemical degradation (ECD). ECD happens when coolant flowing through dissimilar metals creates an electrical charge that accelerates corrosion. The additive package in G12 is specifically designed to prevent this galvanic corrosion that can eat through water pump seals and radiator tubes.
RAVENOL OTC Concentrate Protect C12+ (G12+)
G12+ is free-silicate and based on ethylene glycol and carboxylate compounds.
RAVENOL OTC Concentrate Protect C12+ is a G12+ compatible coolant concentrate built on Organic Acid Technology (OAT) using monoethylene glycol (1,2-ethanediol) as the base. The formula contains no silicates, borates, nitrites, or phosphates, making it suitable for long-life applications in aluminum-heavy cooling systems.
The concentrate comes violet (lila) in color and carries VW TL 774-F approval, which is the G12+ specification. Density sits at 1130 kg/m³ at 20°C, with a flash point above 110°C. The pH value ranges from 7.5 to 8.5 when mixed at 50% concentration, and reserve alkalinity measures greater than 5.5 ml 0.1n HCl.
Mix the concentrate with distilled or deionized water before use. For -37°C frost protection, you’re looking at a 50/50 mix. If you need protection down to -20°C, run 35% antifreeze to 65% water. For extreme cold down to -50°C, increase the ratio to 60% antifreeze and 40% water. At 50% concentration, the freezing point hits -37°C, while the undiluted boiling point ranges from 175°C to 187°C.
RAVENOL OTC Concentrate can mix with other OAT coolants, but avoid mixing it with MAN Type NF/N formulations. Flush the system before switching coolant types to prevent compatibility issues.
Also meets specifications for:
- Mercedes-Benz MB 325.3
- MAN 324 SNF
- Ford WSS-M97B44-D
G12++ (G12 Plus Plus) Coolant
G12++ (G12 Plus Plus) is almost the same as the G12+ coolant. However, it is formulated with much more advanced additives – silicate additives.
G12++ has been discontinued and replaced by newer coolants. VW introduced G12++ around 2006 as a Si-OAT (Hybrid Organic Acid Technology) formulation meeting VW TL 774 G specification. The fluid was typically pink, though some batches appeared purple. The key change from earlier G12 versions was adding silicates to the OAT inhibitor package.
G13 initially replaced G12++ around 2008-2009, switching to a glycerin base for environmental reasons. However, G13 had issues with buildup and clogging, leading VW to develop G12evo as the current replacement. G12evo’s formulation is closer to G12++ than to G13, essentially bringing back the ethylene glycol base with improved inhibitors.
Note: G12+ and G12++ are not the best-suited coolants for newer VW and Audi vehicles.
G13-Compatible Coolant
G13 is VW’s discontinued glycerin-based coolant specification that briefly replaced G12++ around 2008-2009. The fluid is purple or violet in color and was marketed as more environmentally friendly, producing roughly 11% lower CO2 emissions during manufacturing compared to traditional glycol-based coolants.
VW developed G13 using a hybrid Si-OAT formula that combined glycerin with silicates for aluminum corrosion protection. The coolant was backwards compatible with G12, G12+, and G12++ systems and carried VW TL 774-J approval.
Despite its environmental benefits, G13 had serious technical problems. The glycerin and silica additives would separate from the water and cling to aluminum components, causing sludge buildup that clogged heater cores and oil coolers. The formula was extremely sensitive to water quality and would sludge up if mixed with anything except distilled water.
VW abandoned G13 around 2019-2020, replacing it with G12evo. G12evo returned to an ethylene glycol base similar to G12++ rather than continuing with G13’s problematic glycerin formulation.
RAVENOL LGC Protect C13 Concentrate
G13 is the newest OEM equivalent of G12. This more recent coolant is formulated with silicate additives for maximum aluminum protection
RAVENOL LGC is a G13-compatible coolant concentrate using a hybrid formula that combines monoethylene glycol with 20% glycerin additive. The product uses Si-OAT (Hybrid Organic Acid Technology) by blending glycerin and silicates with organic inhibitors for extended service life.
The concentrate comes violet (lila) in color and carries VW TL 774-J approval, which is the G13 specification. Density sits at 1140 kg/m³ at 20°C with a flash point of 110°C. The pH value hits 7.8 at 50% concentration, and reserve alkalinity measures 5.5 ml 0.1n HCl. At 50% mix, the freezing point drops to -35°C while the undiluted boiling point reaches 170°C.
Mix with distilled or deionized water before use. Flush the system before switching coolant types. RAVENOL claims this formula can mix with other coolant types, though compatibility depends on the specific formulations involved.
Don’t get confused. C13 is Ravenol’s branding while G13 is VW’s coolant specification. C13 is compatible with G13.
Also meets specifications for:
- VW G012A8FM1, G012A8FM8, G012A8GM9
- Audi, Skoda, Seat
Compatibility of G12, G12+ / G12++, and G13
Newer VW coolants are backwards compatible with older generations, but mixing reduces protection and going backwards isn’t recommended. G13 can safely mix with G12+ and G12++, and G12++ is fully compatible with G12+. However, mixing G13 with older formulations slightly reduces corrosion protection.
Never use older G12 in systems requiring G13. More critically, never mix G-series coolants with conventional green or non-OAT fluids. When OAT coolants (acidic) meet conventional coolants (alkaline), they form salts that precipitate as thick sludge, clogging radiators, water pumps, and engine passages.
Best practice: flush the system completely with distilled water before switching coolant types, even between compatible VW specifications. Always dilute concentrated coolant with distilled water, not tap water. Minerals in tap water can score water pump sealing surfaces and increase electrical conductivity in the cooling system.
G12+
G12++
G13
The table below shows the compatibilities and differences between G-series antifreeze.
Pentosin/ Pentofrost SF (without silicates)
The Pentosin coolant is an eco-friendly antifreeze. It does not contain amines, nitrites, phosphorus additives, and silicates
Pentofrost SF is a G12+ compatible antifreeze concentrate built for multipurpose applications in water-cooled engines. The formula is silicate-free and contains no nitrites, amines, or phosphorous additives, making it suitable for non-ferrous metals and aluminum cooling systems.
The concentrate comes pink and clear with a density of 1115 kg/m³ at 20°C. Flash point exceeds 110°C, and the undiluted boiling point tops 175°C. Water content maxes out at 5%, with a pH value of 8.0. At a 50/50 mix with water, the boiling point hits 109°C while the freezing point drops to -37°C.
Pentofrost SF meets ASTM D-3306 and carries VW TL 774 F approval, which is the G12+ specification. Mix the concentrate with distilled water at 50/50 for optimal freeze and corrosion protection.
Also meets specifications for:
- Ford WSS M97B44-D
- GM/Opel/Saab/Vauxhall (approved)
- Jaguar/Land Rover STJLR.651.5003
- Zeppelin/Caterpillar (approved)
- Porsche (multiple reference numbers)
Pros
- Manufactured to the OE applications
- Protects against cavitation and corrosion
- Meets ASTM D-3306 and TL 774 F specifications
Cons
- More expensive than the OEM coolant
- Does not contain premium additives
Zerex G30 Phosphate and Silicate Free
ZEREX G30 is phosphate-free and silicate-free antifreeze/coolant. It contains ethylene glycol for optimal protection.
Zerex G30 is a G12 compatible antifreeze concentrate built on Organic Acid Technology (OAT) using an ethylene glycol base. The formula contains no phosphates, silicates, borates, nitrates, amines, or nitrites. It meets silicate-free requirements for Japanese manufacturers and phosphate-free specs for European automakers.
The concentrate is dyed purple and carries VW TL-774D approval, which is the G12 specification. The undiluted product has a flash point of 250°F (121°C) and weighs 9.407 lbs per gallon at 60°F. At 50% dilution with water, the freezing point drops to -34°F (-36°C) while the boiling point reaches 265°F (128°C) with a standard 15 psig radiator cap.
Valvoline claims a service life of up to five years or 100,000+ miles. The product remains storage stable for five years as concentrate or diluted. Mix with distilled water at 50/50 for optimal protection.
Also meets specifications for:
- Mercedes-Benz MB 325.3
- Ford Europe WSS-M97B44-D
- Detroit Diesel DFS93K217ELC
- Deutz DQC CB-14
- MTU (approved)
- Fiat Chrysler MS-12106
- Cummins 90T8-4
- MAN 324 SNF
- Porsche/Audi
- Yanmar/Scania
Pros
- Contains a high-quality defoamer
- Service life of up to 150,000 miles or 5 years
- Provide better protection for hoses, gaskets, or plastics
- Cheap price
Cons
- Can only use for older vehicles
G13
Pentofrost SF
ZEREX G30
Related: Coolant Boiling In Reservoir: Causes & Solutions
Frequently Asked Questions
What is G12 coolant and how is it different from older coolants?
G12 is an Organic Acid Technology (OAT) coolant that uses organic acids for corrosion protection instead of the silicate-based inhibitors found in older green coolants. The OAT formula lasts longer, is less toxic due to its propylene glycol base, and better protects against electrochemical degradation that corrodes rubber and metal components.
Is G12 coolant silicate-free?
Yes, G12 is completely silicate-free. The formula contains no nitrates, amines, phosphates, borates, or silicates. It’s a pure OAT coolant known commercially as BASF Glysantin G30.
What specifications does G12 coolant meet?
G12 meets VW TL 774-D specification and is chemically equivalent to BASF Glysantin G30. It’s also similar to Dex-Cool formulations that meet GM specifications.
Can G12 coolant be mixed with other coolants?
G12 mixes safely with G12+, G12++, and G13, though mixing with G13 may slightly reduce corrosion protection. Never mix G12 with conventional green coolants or non-OAT formulas. The incompatible chemistries form thick sludge that clogs radiators, water pumps, and engine passages.
How often should I change G12 coolant?
VW recommends changing G12 every 30,000 to 50,000 miles, though the coolant can last up to five years or 100,000 miles. After your vehicle hits five years old, consider flushing every two years regardless of mileage.
What happens if I use the wrong coolant in a G12 system?
Using non-OAT coolants causes sodium silicates to precipitate into thick brown sludge that clogs your entire cooling system. Wrong coolants also accelerate galvanic corrosion in aluminum parts, damage water pump seals, and can cause overheating.
What’s the difference between concentrated and pre-mixed G12?
Concentrated G12 requires dilution with distilled water before use, typically at 50/50 ratio for optimal protection. Pre-mixed 50/50 comes ready to pour.
Can I use G40 instead of G12?
Yes, G40 (equivalent to G12++) works as a direct replacement for G12 systems. G40 is a Si-OAT formula that reintroduces silicates while maintaining OAT compatibility, and many owners prefer it over the problematic G13 coolant that VW briefly used.
Final Verdict
Summarily, these are the best G12 coolant equivalents in the market. However, it is important to reiterate the need to flush out your old coolant before pouring another different coolant.
I recommend you to stick to OEM coolant if your VW vehicle is under warranty. Otherwise, the dealer might void it.
When you want to look for a cheaper alternative, ZEREX G30 is a good equivalent option. However, Pentosin is more popular than ZEREX because it is OEM recommendation. But the high price makes it a big downside for the product. You can consider these factors to pick the right item for your VW.
ZEREX G30
Pentofrost SF
Related Reads
- Toyota Super Long Life Coolant Equivalent Discover alternatives to Toyota Super Long Life Coolant, offering insights into finding the best G12 coolant equivalents – Learn more.
- Subaru Super Coolant Equivalent Explore substitutes for Subaru Super Coolant to identify suitable G12 coolant equivalents – Read more.
- Motorcraft Coolant Equivalent: [Orange & Premium Gold] Learn about Motorcraft coolant equivalents to find compatible alternatives for G12 coolant – Find out more.
- Mopar Coolant Equivalent [OAT & HOAT] Understand Mopar coolant equivalents to help you select the right replacement for G12 coolant – Explore here.
- Kubota UDT Hydraulic Fluid Equivalent Discover Kubota UDT hydraulic fluid equivalents that provide insights into high-performance alternatives, similar to G12 coolant – Discover now.
![Motorcraft Coolant Equivalent: [Orange & Premium Gold]](https://oilsadvisor.com/wp-content/uploads/2021/07/motorcraft-coolant-1024x576.png)
Ryan,
Thank You for the article and advice. I’m still a little confused though. This subject has multiple opinions across the internet and message boards. I need to replace the timing belt and water pump in my 2002 MKIV VW Jetta. I used the old original G12, per owner’s manual, bought from the dealer last time I changed the belt and pump. This time I can’t find any of the original G12 because it is discontinued, so I bought OEM 50/50 mixture G13 from dealer. Should I send the G13 back and get Pentosin, Zerex G30 or Ravenol? If so, which of these would you recommend? Thanks
Hi Rechard,
As I clarified in the article, G13 is compatible with the old G12. However, it is not recommended for VW manufactured from 2008, you can see the table I showed in the article. You are driving 2002 VW Jetta, go for the Pentosin. It’s OEM recommended, so you will not worry about the quality.
Thank you for your question!