My Toyota 3MZ-FE engine valve cover gasket rear bank is leaking.
There's a Fel-Pro VS50588R copycat kit, which matches PN 11214-0A010,
But the material isn't stated, so I can assume it's a nitrile-butadiene rubber & not a vinyl methyl silicone (or they would said that it was).
How important is silicone rubber for an aluminum V6 valve cover gasket?
The Felpro gasket is good to go if installed according to instructions. It is a "proprietary cork rubber" composition called "permadry" according to FelPro data. (and may actually be superior to the OEM for service use) In over 60 years I have never had issues with FelPro service gasket products (including over 12 years in Toyota dealerships)
Silicone is more resistant to higher temperatures and automotive fluids.
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