Auto Transmission Stop Leak 325ml

Product code: WYN64558

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£13.99

£11.66 ex. VAT

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Wynns Auto Transmission Stop Leak 325ml

Part Number: WYN64558

Wynns Auto Transmission Stop Leak is a specialized additive designed to stop and prevent leaks in automatic transmission systems. This effective 325ml formula contains advanced seal conditioners that rejuvenate hardened, shrunk, or deteriorated transmission seals and gaskets, helping to reduce or eliminate fluid leaks without requiring mechanical repair. The non-clogging formula is compatible with all automatic transmission fluids and won’t interfere with normal transmission operation, providing a cost-effective solution for addressing fluid leakage.

Product Characteristics

• Revitalizes and expands dried or shrunken rubber seals and gaskets.
• Stops or reduces automatic transmission fluid leaks.
• Compatible with all ATF types, including synthetic.
• Non-clogging formula won’t block valves or passages.
• Helps maintain seal elasticity in aging transmissions.
• Reduces fluid loss through external leaks.
• Prevents transmission fluid stains on driveways and parking areas.
• More economical than mechanical seal replacement.
• Simple to apply – just add to transmission fluid.
• Continues working throughout the service interval.

Storage & Shelf Life: Store in a cool, dry place in tightly closed original packaging. Protect from frost and direct sunlight. Shelf life 5 years from production date.

How to Use

• Ensure transmission fluid is at normal operating temperature before application.
• Add entire contents (325ml) through the dipstick tube or fill port.
• One bottle treats most passenger vehicle transmissions (up to 8–10 litres of ATF capacity).
• Drive normally, cycling through all gears to circulate the treatment.
• Results may appear within 100–200 miles, with maximum benefit after 300–500 miles.
• For preventative maintenance: use with every other transmission fluid change.
• For active leaks: a second treatment may be added after approx. 1,000 miles if needed.

 

Auto Transmission Stop Leak is especially useful for addressing leaks from pan gaskets, pump seals, and housing seals without expensive repair. Not suitable for severely damaged or cracked components, or transmissions requiring mechanical repair. Not recommended for CVT or DCT systems unless specified on the packaging. For enhanced performance benefits including improved shift quality and lubrication, consider using Wynns HPLS Transmission Treatment & Stop Leak.