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

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

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€ 43.28

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗 Seal it once, drive forever – the ultimate engine leak fix!

LIFETIME WELD SEAL - Ceramic microfibers & copper create a permanent, heat-conductive bond
ENGINE SAFE FORMULA - Non-corrosive, won’t damage cooling systems when used as directed
THERMAL FLEXIBILITY - Expands & contracts with engine heat cycles for lasting durability
INSTANT ENGINE RESCUE - Seals large & micro leaks in minutes, saving costly repairs
UNIVERSAL COMPATIBILITY - Perfect for aluminum, cast iron, plastic & all antifreeze types

Hi-Gear HG9048s Insta-Seal is a 236ml liquid ceramic-microfiber and copper-based engine block sealer that permanently repairs leaks in head gaskets, cylinder heads, radiators, and core plugs. Compatible with aluminum, cast iron, and plastic components, it withstands temperatures over 200°C and safely works with all antifreeze types. Designed to form a heat-conductive, flexible weld that lasts the life of your engine, Insta-Seal prevents costly engine damage by sealing cracks from the inside out.

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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