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I'm an amateur mechanic. Recently I met an experienced car mechanic and he told me that if I dip a new out of the box cylinder head in gasoline mixed with engine oil for a couple of hours, it would last a lot longer than usual. I wanted to know if there's anyone who had experience about this and or if he was just messing with me!?

Thanks for the time you took to answer my question; And I'm sorry for my English.

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    Welcome to Motor Vehicle Maintenance & Repair! In my 35+ years of wrenching, this is nothing I've ever heard of before. I think if Felpro wanted this done, they'd have it done from the factory. I would NEVER do this to my gaskets. ANY of my gaskets.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Aug 31, 2020 at 19:37
  • Thanks @Pᴀᴜʟsᴛᴇʀ2 I would be more than happy to use your opinion when I'm working and yes I wouldn't do that to my gaskets either I just wanted make sure I'm not missing out on something.
    – PBlague
    Aug 31, 2020 at 20:05
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    I left this as a comment because maybe someone knows better than I do ... There are a couple of people who've been around for awhile who might have an idea where this comes from and the reasons why someone might be doing it in the first place. I would NOT be one of them.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Aug 31, 2020 at 20:20
  • Sounds like grandpa's folklore to me, like storing a car battery on wood. Gasoline will damage the valve seals if its a fully assembled head.
    – Moab
    Aug 31, 2020 at 20:40
  • As you specify gasket in the question title, I would not wash a new gasket in gas as some gaskets are pre-treated with products to help the seal.
    – Solar Mike
    Sep 1, 2020 at 8:52

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