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.

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.

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.

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🚀 Seal leaks fast, drive worry-free forever!

INSTANT LEAK LOCKDOWN - Seals radiator, head gasket, freeze plugs & more in one powerful step.
EFFORTLESS APPLICATION - Just shake and pour—no draining or flushing required, saving you time and hassle.
TRUSTED PROFESSIONAL GRADE - Mechanic-approved, non-corrosive formula that won’t clog your cooling system.
UNIVERSAL COOLANT COMPATIBILITY - Works seamlessly with all antifreeze types for versatile use across vehicles.
BUILT FOR HEAVY DUTY PERFORMANCE - Engineered for trucks, tractors, and industrial vehicles ensuring long-lasting durability.

K-Seal ST5516 HD is a professional-grade, one-step coolant leak repair solution designed to permanently seal leaks in radiators, head gaskets, freeze plugs, and more. Compatible with all antifreeze types, it requires no draining or flushing—just shake and pour. Engineered for heavy-duty vehicles like trucks and tractors, it delivers durable, non-corrosive repairs trusted by mechanics worldwide.

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TrustScore 4.5 | 7,300+ reviews

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Received my product in pristine condition. Great service overall.

1 month ago

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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

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

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