It fires a 4.6x30mm cartridge.
Sealant does not work. Replace faulty seal or gasket.
Yes there are sealers out there that can be used to seal or repair the gasket
You cannot and should not buy a used head gasket. If you have a blown head gasket you replace it with a new gasket. The gasket will cost very little. The labor to replace the gasket is where the cost is. Expect to pay from $500 to $1,000. This is a major repair that takes time.
A gasket is used between two surfaces to make a seal.
A used head gasket is not worth anything, because it cannot be reused.
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Sure. 100% silicone can be used. The sealant is not necessary as the gasket does the sealing anyway. the sealant does help hold the gasket in place for easier installation.
The head gasket is used to seal between the engine cylinder head and the engine block
an exhaust flange gasket, is the gasket,commonly called a donut that is used to seal where the exhaust pipe is bolted to the exhaust manifold
no gasket is used
Any parts store can provide you with the correct gasket.