Coat a saucepan with 2 tablespoons of the oil and warm over medium-low heat. Add the garlic and cook, stirring, until soft. Add the crushed tomatoes and sugar; season with salt and pepper. Turn the heat up slightly to medium and simmer the sauce for 10 minutes, stirring occasionally. Stir in the basil and the remaining olive oil. Toss with spaghetti, if desired.