Kemitec PG55 Series — The Ultimate Coolant for Every Engine
Kemitec is Japan’s No.1 aftermarket coolant brand, trusted by motorsport professionals and performance drivers worldwide. From circuit racing to daily driving, the PG55 series delivers advanced cooling stability, long-term protection, and environmental responsibility — all refined through Japan’s top racing championships.
Coolant Comparison: Propylene Glycol (PG) vs. Ethylene Glycol (EG)
Understanding the difference between propylene glycol and ethylene glycol explains why Kemitec’s PG55 coolants perform better in both racing and everyday environments.
| Feature | Propylene Glycol (PG) | Ethylene Glycol (EG) |
|---|---|---|
| Toxicity | Non-toxic — safer for people and the environment | Toxic — harmful if ingested or leaked |
| Eco-Friendliness | Biodegradable and environmentally responsible | Harmful and difficult to dispose of safely |
| Thermal Stability | High — resists boiling and cavitation under heavy load | Moderate — performance drops faster under heat stress |
| Boiling Point | Higher in 55% blends (around 107°C) | Lower — more prone to vapor lock |
| Heat Transfer | High heat capacity for smoother temperature control | Slightly faster conduction but less stability overall |
| Motorsport Proven | Used in Super GT, D1GP, and endurance racing | Rarely used in motorsports |
The Golden Ratio (55:45) — Kemitec’s Cooling Advantage
At the heart of PG55 RC lies Kemitec’s unique Golden Ratio (55% propylene glycol : 45% ultra-purified water). This balance was developed through real motorsport testing to achieve maximum thermal stability and consistent cooling under high stress.
Compared with common 50:50 mixes, the Golden Ratio formula provides smoother temperature control, improved heat capacity, and longer-lasting protection — making it the choice of top Japanese racing teams.
Learn More About the Golden Ratio →
Why Choose Kemitec?
1. Scientifically Balanced Cooling
Each PG55 formula is tuned with the optimal glycol-to-water ratio to deliver precise temperature control, consistent performance, and superior protection under any condition.
2. Real Motorsport Development
Proven in SUPER GT, D1 GRAND PRIX, and All Japan Road Race — the same coolant used by professional teams is available to you without dilution or additives.
3. Environmentally Responsible
All PG55 coolants are made with non-toxic propylene glycol and ultra-purified water, ensuring performance without compromising safety or sustainability.
4. Long-Term Reliability
Advanced Organic Acid Technology (OAT) protects aluminum, cast iron, and mixed-metal engines from corrosion, scaling, and electrolysis for up to 5 years of use.
5. Pure Water Technology
Kemitec uses 100% deionized and ultra-purified water — eliminating minerals that cause internal corrosion and electrolysis. This ensures stable performance even in high-output engines.
The PG55 Series Lineup
PG55 RC — For Motorsports and High-Performance Cars
Antifreeze Type: 55:45 Golden Ratio Prediluted
Developed for Japan’s top racing series, PG55 RC is the same coolant trusted in SUPER GT and D1GP. It provides unmatched cooling stability, thermal endurance, and non-toxic safety — ideal for high-RPM and forced-induction engines.
Best for: Track and performance cars — GT-R, Silvia, 86/BRZ, Supra, Corvette, Mustang
PG55 HQ — For Everyday and Street Performance
Antifreeze Type: 50:50 Precision Prediluted
PG55 HQ delivers the same engineering precision as RC but in a cost-effective 50:50 ratio. It offers fast warm-up, efficient heat control, and eco-friendly protection for everyday cars.
Best for: Passenger cars, daily drivers, and light-tuned vehicles
PG55 NR358 — For Diesel and Cast Iron Engines
Antifreeze Type: 55:45 Heavy-Duty Formula
Designed for diesel, cast iron, and heavy-duty engines. Its enhanced additive package provides extra corrosion protection and thermal stability under continuous load.
Best for: Diesel trucks, industrial engines, and classic JDM vehicles with cast iron blocks
PG55 Vintage — For Classic and Antique Cars
Antifreeze Type: 50:50 Gentle Protection Formula
Specially blended for older engines using copper, brass, and cast iron materials. PG55 Vintage protects against corrosion and cavitation while maintaining the character of classic vehicles.
Best for: Classic and vintage gasoline engines — Datsun 240Z, AE86, Toyota Crown, Mustang, Jaguar E-Type
Which PG55 Should You Choose?
Each PG55 coolant is formulated for a specific driving style and engine type:
- PG55 RC — For circuit racing, drifting, and high-performance engines
- PG55 HQ — For daily drivers and balanced performance
- PG55 NR358 — For diesel and heavy-duty cast iron engines
- PG55 Vintage — For classic and long-term stored vehicles
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