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 Permanent Block Sealer - 8 fl. oz.

Product ID: 392705817

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

🔧8 fl. oz. capacity

🧪Compatible with all antifreeze

🛠️Repairs all leaks

Description

🔒 Seal it, don’t stress it!

SEAL THE DEAL - Permanently repairs leaks in gaskets, radiators, and more!
VERSATILE FIX - Works on plastic, aluminum, and cast iron—your all-in-one solution!
NO DRAIN NO PAIN - Compatible with all antifreeze types—no draining required!
WARRANTY FRIENDLY - Rest easy—this won't void your manufacturer's warranty!
ADVANCED TECHNOLOGY - Ceramic micro-fibers and copper create a strong, lasting bond!

The Hi-Gear HG9048s Insta-Seal Permanent Block Sealer is an 8 fl. oz. solution designed to permanently repair leaks in various automotive components, including gaskets, radiators, and intake manifolds. Its advanced formula is compatible with all antifreeze types and does not require draining, making it a versatile and warranty-friendly choice for car maintenance.

Specifications

ASIN	B005VXFBIC
Brand Name	HI-GEAR
Color	clear
Compatible Material	Plastic
Customer Reviews	3.7 3.7 out of 5 stars (137)
Global Trade Identification Number	00009603190484
Item Dimensions	5.7 x 5.7 x 18.1 centimeters
Item Form	Liquid
Item Weight	272 g
Manufacturer	Hi-Gear
Material Type	Plastic
Model	HG9048s
Number of Items	1
Part Number	HG9048S
Style Name	Liquid ceramic-microfiber and copper sealant
Surface Recommendation	Engine components (Plastic, Aluminum, Cast Iron)
UPC	009603190484
Unit Count	8 Milliliters
Warranty Description	3 year money back guarantee
Water Resistance Level	Water Resistant

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