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
272 g
Material
Plastic
Style
Liquid and

🔥Heat resistant up to 200°C

⏱️Fast-acting permanent seal

🛠️Works on aluminum & cast iron engines

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Description

🛡️ Seal it once, drive forever—never fear leaks again!

INSTANT LEAK LOCKDOWN - Seals large & microscopic cracks with ceramic micro-fibers and copper for a weld-like fix.
COOLING SYSTEM FRIENDLY - Formulated to protect and not harm your cooling system or antifreeze.
THERMAL FLEX TECHNOLOGY - Expands and contracts with engine heat cycles, preventing hot spots and ensuring durability.
LIFETIME ENGINE PROTECTION - Once sealed, the fix lasts the life of your engine—no more costly head gasket repairs.
UNIVERSAL ENGINE COMPATIBILITY - Safe and effective on all aluminum and cast iron engines, including radiators and heater cores.

Hi-Gear HG9048s Insta-Seal is a 236ml advanced engine block sealer that permanently repairs leaks in head gaskets, cracked cylinder heads, radiators, and heater cores. Using a unique blend of ceramic micro-fibers and copper fines, it creates a heat-resistant, flexible weld that lasts the life of your engine without damaging cooling systems or antifreeze.

Specifications

ASIN	B005VXFBIC
Best Sellers Rank	28,970 in Automotive ( See Top 100 in Automotive ) 264 in Fillers, Adhesives & Sealants
Brand	Hi-Gear
Colour	clear
Compatible Material	Aluminum, Plastic, Cast Iron
Country Of Origin	USA
Customer Reviews	3.7 3.7 out of 5 stars (140)
Global Trade Identification Number	00009603190484
Item Dimensions	5.7 x 5.7 x 18.1 centimetres
Item Form	Liquid
Item Weight	272 g
Manufacturer	Hi-Gear
Manufacturer Part Number	HG9048S
Material	Plastic
Model Number	HG9048s
Number of Items	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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€ 36.67

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In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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TrustScore 4.5 | 7,300+ reviews

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