Keskustelujen arkisto

Hello!
I'm looking for a comic story I read as a child in the late 70s or in the first years of the 80s.
I dont remember much except that if featured Donald Duck and his nephews and at a point they were like in the film Fantastic Voyage or Innerspace. But instead of being miniaturized and trapped in a human body, they were in the inside of a car's engine : Going through the pipes where the gasoline pass, witnessing how the engine works, etc.
I dont remember how they managed to get out and gained back their normal sizes and if Gyro Gearloose appears in the story or not.

You sir are my hero!
Needless to say, I'm very impressed! I've been trying to find back that story for years! Thanks a million!