A Great Pepper Salad

1 (32 ounce) jar sweet pepper rings, drained

1 (4 ounce) jar diced pimento peppers, drained

1 pound pepperoni sausage, cubed

1 pound provolone cheese, cubed

1/2 pound Swiss cheese, cubed

1/2 pound sharp Cheddar cheese, cubed

1 (6 ounce) can mushrooms, drained and thinly sliced

2 (6 ounce) cans black olives, drained and thinly sliced

4 cloves garlic

4 1/2 tablespoons dried oregano

1 cup canola oil

1/4 cup olive oil