Deliver to France

For best experience Get the App

DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan
KOREA

Customer Services

About Us

Customer Support

K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair

K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair

Q: how much do i need to pour in a diesel 1 ton cummins

You need this one bottle for a Dodge 3500 hd. I have this one bottle in my HD Freightliner 330hp MBZ engine hauling freight (54,000 lbs cap) 6 days a week and it stopped my coolant leak in the engine bay and heater core with no blockage and no. My opinion, Many reviews say products dont work BECAUSE most people dont take care of their equipment and their vehicles are old, high mileage and no maintenance done. None of the add to a tank products are as good as replacing with new parts but thats expensive, we get it. This may or may not fix your problem but its a low cost gamble with a high probability of success. Dont listen to the negative reviews. If the problem comes back, your damage was too far gone and in need of replacement anyway.

Q: Will this work with aluminum heads?

It works equally well with cast iron or aluminum. Great Stuff. Not a long-term solution, but it will buy you a lot of time.

Q: Tried using alumaseal, which isn't working. will i need to flush the system before using the k-seal?

I used the HD Truck bottle on my 1998 GEO Tracker ( used 1/3 of the bottle ) of K-Seal and it worked. I have used so many to no avail. To answer your question, I must have @ least 3 to 4 other sealers in my colling system when I added K-Seal. It's been almost a year & no adverse effects having not flushed my radiator. Should I have flushed the radiator & the system? Yes, I should have.

4.3/5

Product ID: 729092387

Secure Transaction

💪Heavy-duty, industrial strength

🔧One-step, no drain or flush

⏱️Seals leaks fast & permanent

Frequently Bought Together

K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

PEAK 50/50 Prediluted Antifreeze and Coolant for All Engine Cooling Systems

K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

Description

🚗 Seal it once, drive forever—no leaks, no limits!

TRUSTED TESTED - Millions sold worldwide, independently ASTM D3147 verified
ENGINE SAFE FORMULA - Non-corrosive and won’t clog your cooling system
EFFORTLESS APPLICATION - Just shake, pour, and drive—no draining or flushing needed
HEAVY DUTY RELIABILITY - Built for commercial, agricultural & large engines
INSTANT LEAK SEALING POWER - Fix radiators, head gaskets & more in one quick step

K-Seal ST5516 HD is a professional-grade, multi-purpose coolant leak repair solution that permanently seals holes and cracks in water-cooled engines. Designed for heavy-duty and industrial vehicles, it requires no draining or flushing—just shake and pour. Compatible with all antifreeze types, it’s trusted by mechanics worldwide and independently tested to meet ASTM D3147 standards.

Specifications

Manufacturer	Solv-Tec
Brand	K-Seal
Model	ST5516HD
Product Dimensions	14.99 x 10.41 x 4.83 cm; 531 g
Item model number	ST5516HD
Is Discontinued By Manufacturer	No
Item Dimensions L x W x H	15 x 10.4 x 4.8 cm
Item Weight	531 g

Have a Question? See What Others Asked

Does it work on potentially warped heads

how much do i need to pour in a diesel 1 ton cummins

Will this work with aluminum heads?

Tried using alumaseal, which isn't working. will i need to flush the system before using the k-seal?

Common Questions

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

View all Trustpilot reviews