After you use it you have to change the motor oil my oil look like milk ?

A water cooling system leak into the interior of the engine mixing with the oil lubricating system produces a yellowish off white foam. Either a cracked block or head or a leaking head gasket are the usual suspect for this. I even have had a badly leaking cooling tube under the intake manifold on a 4.6 Liter Ford that no coolant leak additive could fix--a removal of intake manifold and replacement of tube was the only fix. It is very common for Aluminum head/block warpage due to even a one time overheating to cause head gasket leakage that only engine teardown and having the warp leveled can fix. For reasonably small leaks, I have used radiator sealer to stop them.

Do you have to flush the radiator first?

Yes, I would flush it first, then add the installation seal.

Does it says for how many cylinders it will work per .oz used

Didn't work on 6 cylinder for me.

Will this work on a cracked block and water cooled manifold in a closed Mercruiser 5.7 liter V8 boat engine? Thanks.

It depends on how big the crack is. If very big probely not. My experience with with water manifold not likely.

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Hi-Gear HG9048s Insta-Seal Head Gasket Fix Permanent Engine Block Sealer - 236 millilitres

Hi-Gear HG9048s Insta-Seal Head Gasket Fix Permanent Engine Block Sealer - 236 millilitres

Product ID: 56394672

Details

Brand
Hi-Gear
Item dimensions L x W x H
5.7 x 5.7 x
Item weight
0.6 Pounds
Material
Plastic
Style
Liquid and

🔥Heat resistant up to 200°C

⏱️Fast-acting permanent seal

🛠️Works on aluminum & cast iron

17539 Ft

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Description

🔥 Seal it once, drive forever — the ultimate engine lifesaver!

CERAMIC COPPER FUSION - Microfibers & copper create a heat-conductive, durable weld
ENGINE LIFE LONGEVITY - Once sealed, lasts the entire engine lifespan—no repeat fixes
INSTANT LEAK LOCKDOWN - Seals large & micro cracks fast for zero downtime
COOLING SYSTEM FRIENDLY - Non-corrosive formula protects your radiator & core plugs
UNIVERSAL ENGINE COMPATIBILITY - Safe on aluminum, cast iron & plastic cooling parts

Hi-Gear HG9048s Insta-Seal is a 236ml liquid ceramic-microfiber and copper-based engine block sealer designed to permanently fix leaks in head gaskets, cracked cylinder heads, radiators, and core plugs. Compatible with aluminum, cast iron, and plastic components, it forms a heat-resistant, durable weld that expands and contracts with engine temperature changes, ensuring a lasting seal that protects the cooling system without damage.

Specifications

ASIN	B005VXFBIC
Best Sellers Rank	62,693 in Automotive ( See Top 100 in Automotive ) 376 in Fillers, Adhesives & Sealants
Brand	Hi-Gear
Colour	clear
Compatible Material	Aluminum, Plastic, Cast Iron
Customer Reviews	3.6 3.6 out of 5 stars (144)
Global Trade Identification Number	00009603190484
Item Dimensions	5.7 x 5.7 x 18.1 centimetres
Item Form	Liquid
Item Weight	0.6 Pounds
Manufacturer	Hi-Gear
Manufacturer Part Number	HG9048S
Material	Plastic
Model Number	HG9048s
Number of Items	1
Number of Packs	1
Style Name	Liquid ceramic-microfiber and copper sealant
Supported Standards	ASTM C-920
Surface Recommendation	Core Plugs, Cylinder Head, Engine Block, Heater Matrix, Radiator
UPC	009603190484
Unit Count	236.0 millilitre
Water Resistance Level	Water Resistant

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17539 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hungary.

Secure transaction

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