Many flavors of Kroger Salad Dressings (sold at Ralphs markets on the West Coast) are now certified Kosher under O/U supervision. Check the label on each bottle of dressing for the O/U symbol.
From The KIB: Pesach News – Avocado Oil and Spray
All Pure Virgin Avocado Oil & Spray (without additives), are fine for use on Pesach without a special Pesach designation on the label.