I've always considered mayonnaise to be one of the "perks" of LC eating. However...soybean oil. Almost all of it, including those that claim "made with olive oil" or some other more healthy alternative.

Joy! I recently discovered an addition to Costco stock:

Sir Kensington's Avocado Oil Mayonnaise. Not "made with." No suspicious ingredients that I could see on the label.

It tastes good right out of the jar, and I use it for everything else: sauces, deviled eggs, tuna salad, etc.