Will putting a 2 liter of Coca-Cola in cars gas tank ruin the engine?

Yes, putting two liters of Coca-Cola in a car's gas tank will almost certainly cause significant damage and is extremely likely to ruin the engine. Here's why:

* Sugar: The high sugar content will gum up the fuel injectors and fuel lines. The sugar will solidify and clog the delicate parts of the fuel delivery system.

* Acidity: The acidity of the cola will corrode metal parts within the fuel system, including the fuel pump, injectors, and possibly even parts of the engine.

* Carbonation: The carbonation will create bubbles in the fuel system, disrupting the fuel flow and potentially leading to airlocks.

* Non-fuel: The cola is not a fuel and provides no energy to the engine. The engine will run poorly or not at all, leading to potential damage from running "dry" or overheating.

The extent of the damage will depend on how much cola is added and how long the engine runs on it, but it's highly unlikely to be a simple fix. It will likely require extensive cleaning, repairs, or even replacement of significant parts of the fuel system and potentially the engine itself.