lot of smoke from the exhaust pipe but stops after about four minutes. on 2003 Mazda Mazda6

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it does that every morning, was told its the engine seat, just changed it but still te same.
(1) Answer
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poss valve seals or valve issue. you may need head work. how many miles and what eng size. v6?
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