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Q:

engine started smoking 4months ago not oil smoke it is deseil exhaust on 2003 GMC Sierra 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
changed motor oil and filter changed feul filter engine still smokes
(1) Answer
u have to change injectors..or maybe try addative