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

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

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.

Product ID: 8435813

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🔧One-step, no flushing needed

🚜Heavy-duty, industrial strength

⏱️Seals leaks in minutes

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 leaks like a pro—fast, permanent, and hassle-free!

ONE STEP ZERO HASSLE - Just shake, pour & go—no draining or flushing required
BUILT FOR THE BIG LEAGUES - Engineered for heavy-duty, commercial & agricultural vehicles
FIX IT FAST STAY ON TRACK - Permanently seals radiator, head gasket, freeze plugs & more in minutes
MECHANIC APPROVED RELIABILITY - Non-corrosive, clog-free formula trusted worldwide & ASTM D3147 certified
UNIVERSAL COOLANT COMPATIBILITY - Works seamlessly with all antifreeze types for ultimate convenience

The ST5516 Heavy-Duty Multi-Purpose Coolant Leak Repair is a 16 oz professional-grade formula designed to permanently seal leaks in water-cooled heavy-duty engines. Compatible with all antifreeze types, it requires no flushing—just shake, pour, and run. Trusted by mechanics and independently tested to ASTM D3147 standards, it delivers fast, reliable, and clog-free repairs for commercial and agricultural vehicles.

Specifications

Manufacturer	Solv-Tec
Brand	K-Seal
Model	ST5516HD
Item Weight	1.19 pounds
Product Dimensions	5.9 x 4.1 x 1.9 inches
Item model number	ST5516HD
Is Discontinued By Manufacturer	No
Manufacturer Part Number	ST5516

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?

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