Bring Car to Cuba via ferry

i guess the problem would be exporting it after although,the aduana says that is you put the car back onto the ship it is considered exported...lol

Ha, ha, ha..... ship the car to Cuba in a container...... swap out the brand new motor and tranny and put in a cuban junk yard engine for the shipment back. Voila, new car parts in Cuba.
Could you ever have fun gaming that system!!!

now what i dont understand is which type of boat would be able to bring a car apart from a ferry

A really luxury yacht ? http://www.grahambleathman.co.uk/images/FAB2med.jpg

What I wonder is what happens if the owner leaves Cuba by some other means than on the boat.

@beardouk according to Aduana whenever the owner leaves,,the car has to leave (or be put on the marina on the boat)

So the 6 months is only possible for a Canadian tourist ?

Many years ago, I saw a small car on a power boat docked at Marina Hemingway. It was like a small Fiat or Smart car. People also do bring motorcycles to Cuba on boats. I assume you would be required to take it with you when you leave. The harbormaster at the Marina should know how to do it. You could just arrive with it and see what happens. They might say you can't take off the boat.

Chris Baker who wrote "Mi Moto Fidel" brought his big Dakar off road racing motorcycle to Cuba and toured all over the island while writing his book. Every night he would park the bike inside his room, because half the Cuban guys wanted to steal it.
Read his book and you can learn about how he did it.

Considering all the old cars in Cuba, the gas that is available must be leaded. Not exactly something you want to use in a car engine designed for unleaded.

There is certainly unleaded available (though there were recent reports of the top grade being restricted).

As of June 2016 only Algeria, Yemen, and Iraq continue widespread use of leaded gasoline.

https://en.wikipedia.org/wiki/Tetraethyllead

So I arrived this past March 27th for 3 weeks with a car rental,Via gives you the car with a full tank.Upon the first fill up in Havana lots of gas stations were out of Especial due to all of the political turmoil in Venezuela,luckily I found one station where the gas station clerk didn't give a crap if I used lower octane, that's not the norm,the clerks usually won't sell you anything but Especial.A memo was sent around to the stations to limit the sale of Especial and as the days went on the shortage became more visible in Havana with cars lining up waiting for Especial,causing traffic jams in some areas as the lines were getting very long.Outside of Havana less noticeable because there are fewer cars but everyone was aware of the shortage of Especial.My understanding is that Russia has picked up the slack on oil deliveries where Venezuela has dropped off ,as usual when it looks like the the chips are down for Cuba,someone comes out of the blue to the rescue.

As far as I know, Beardo, Canadians are the only nationality that can stay in Cuba six months, and that only by having their 3-month visa renewed. That's because we have always played nice with Cuba and never participated in the embargo--plus, paid for the upgrade of the Varadero and Havana Terminal 3 upgrades.