The Prolong Super Lubricants PSL15000 Transmission Treatment is an aftermarket transmission additive aimed at both manual and automatic vehicles. Manufactured by Prolong, this 8 oz. treatment is formulated to reduce friction, heat, and wear in transmission systems—helping to smooth gear shifts and protect against major repairs. Using Prolong’s proprietary AFMT™ (Anti-Friction Metal Treatment) technology, PSL15000 creates a chemically bonded layer on metal surfaces, enhancing performance in both standard and automatic transmissions. Marketed in the mid-range price segment, this product targets drivers seeking to extend transmission life and improve shift quality, especially in vehicles operating under demanding conditions.
1. Functions and Benefits: 4/5
Prolong PSL15000 Transmission Treatment provides several tangible benefits for transmission systems. It is formulated to reduce friction and heat—two of the primary causes of transmission wear and eventual failure. The product excels at promoting smoother shifts in manual transmissions and restoring responsiveness in automatics, particularly in situations requiring quick acceleration. Additionally, the additive helps guard against costly repairs by forming a protective barrier on metal surfaces inside the transmission. However, it is not compatible with CVT systems and may offer limited benefit for very high-mileage vehicles with significant existing wear.
2. Notable Technologies: 5/5
The standout technology in PSL15000 is Prolong’s proprietary AFMT™ (Anti-Friction Metal Treatment). AFMT™ molecules chemically bond to all metal surfaces in the transmission, forming a microscopic protective layer that reduces metal-on-metal contact and resultant heat. This technology distinguishes PSL15000 from many generic additives, which often rely only on surface lubricants rather than advanced chemical bonding. AFMT™ is particularly effective under extreme pressure, which can occur during heavy loads, aggressive driving, or hot climates, thus providing enhanced longevity and protection.
3. Ease of Use: 4.5/5
Using PSL15000 is straightforward—simply add the full 8 oz. bottle directly to the transmission fluid reservoir, whether in a manual or automatic (non-CVT) system. There is no need for complex application tools or special preparation, making it accessible to both DIYers and professionals. One bottle suffices for most standard transmission fluid capacities. The only caveat is ensuring compatibility with the specific transmission type, as the product is not suitable for CVTs or dual-clutch systems.
4. Popularity: 4/5
Prolong PSL15000 is a widely recognized and popular transmission treatment within the aftermarket automotive community. It is frequently recommended in professional and user-generated reviews as a top choice for transmission additives, and it appears in numerous “best of” product guides. Its broad compatibility with both manual and automatic transmissions increases its appeal, though its lack of CVT compatibility limits its reach among the newest vehicle models. The brand’s longstanding reputation and consistent online visibility also support its popularity.
5. Customer Satisfaction: 4/5
Customer feedback for PSL15000 is overwhelmingly positive, especially noting improvements in shift smoothness, reduction of noise, and decreased shuddering. Many users report noticeable performance improvements after a single treatment, such as quieter operation and more consistent gear engagement. However, some negative reviews point out ineffectiveness in severely worn or high-mileage transmissions, suggesting that the product has limitations where mechanical damage has already occurred. Still, the general consensus is that it delivers on its primary promises for most users.
6. Competitive Comparison: 4/5
Compared to other well-known transmission additives like Lucas Transmission Fix and Lubegard Instant Shudder Fixx, PSL15000 stands out for its AFMT™ technology and ease of application. Like Lubegard, it targets shift quality and shudder reduction, but some users report more consistent results with Prolong, especially for smoother shifts. Unlike Lucas, which can sometimes address leak issues, PSL15000 does not claim to swell seals or stop leaks. While Lubegard is compatible with synthetic transmission fluids and all automatics, Prolong is not for CVT use, narrowing its application range slightly.
7. Performance Results: 4/5
In use, PSL15000 often delivers measurable performance gains. Users and reviewers report smoother gear transitions, less transmission “chatter,” and reduced operating noise. The product’s heat and friction reduction properties contribute to prolonging transmission life, especially in vehicles subjected to heavy loads or frequent stop-and-go driving. Results tend to be most noticeable in low- to mid-mileage vehicles; performance improvements are less dramatic in transmissions with advanced wear or damage where mechanical intervention would be needed.
8. Value for Money: 4.5/5
PSL15000 offers strong value, given its performance and the advanced technology it employs. Its mid-range price is competitive against top brands, while the single-bottle formula is sufficient for the majority of vehicles. Considering the potential cost savings from avoiding or delaying costly transmission repairs, the value proposition is compelling for preventative maintenance—especially for daily drivers, light trucks, and older vehicles still in good working order. However, its limitations for very high-mileage vehicles and incompatibility with CVT transmissions should be factored into any purchase decision.
Prolong Super Lubricants PSL15000 Transmission Treatment distinguishes itself through its use of advanced AFMT™ molecular bonding technology and its broad compatibility with both manual and automatic transmissions (excluding CVTs). Its strongest points are the noticeable improvement in shift quality, reduction of friction and heat, and ease of use—making it an ideal choice for car owners looking to maintain or enhance transmission performance in vehicles ranging from daily commuters to light trucks. While the product is less effective for transmissions already suffering from internal mechanical wear or damage, it is a smart investment for preventative maintenance. Compared to market rivals, PSL15000 excels in technological innovation and consistent user satisfaction, though its applicability to newer vehicles with CVT transmissions is a limitation. We recommend PSL15000 for owners of non-CVT vehicles experiencing rough shifts, mild noise, or seeking to prolong transmission life affordably. Overall, the product earns a solid 4/5 rating: Recommended for most applications, particularly as a proactive step to preserve transmission health in standard and automatic gearboxes.
