Sir Kensington's makes a genuinely clean avocado-oil mayo and a genuinely seed-oil-based everything-else. It lands at 3.4 because the clean product is real and good, but the brand's default jar and most of its line are sunflower oil, and nothing about the branding tells you which is which.
The answer depends entirely on which jar you pick up. Sir Kensington’s Avocado Oil Mayonnaise lists avocado oil as its only fat, a clean, short statement. The Classic Mayonnaise, which is the version most stores stock and most shoppers buy on autopilot, is 100% sunflower oil, a refined seed oil. The Special Sauce, the ketchup, and several dressings track the Classic.
So “is Sir Kensington’s seed-oil-free” has no single answer. This review is about buying the right one and treating the rest of the shelf as what it is.
What’s in it
Avocado Oil Mayonnaise: avocado oil, cage-free egg yolks, water, distilled vinegar, salt, lime juice concentrate, citric acid, lime oil. Avocado oil is the only fat. No added sugar. This is a clean mayo by any reasonable standard.
Classic Mayonnaise:sunflower oil, egg yolks, water, lemon juice, distilled vinegar, salt, organic cane sugar, mustard flour, black pepper, citric acid. One hundred percent sunflower oil. Sir Kensington’s uses a higher-oleic sunflower oil, which is lower in linoleic acid than standard sunflower oil and a real improvement over it, but it is still a refined, industrially processed seed oil. If you are avoiding seed oils, the Classic does not qualify.
The brand is owned by Unilever. The naming convention is the practical problem: the clean product is the one that has to say “Avocado Oil” explicitly, and everything without that qualifier is the sunflower-oil line.
Seed oil status
Avocado Oil Mayonnaise: avocado oil is the only fat, clean. Classic Mayonnaise: 100% sunflower oil, a seed oil. Confirmed against Sir Kensington's published product pages (https://www.sirkensingtons.com/us/en/p/avocado-oil-mayonnaise.html and .../classic-mayonnaise.html), September 2026.
Pros and cons
What holds up
- The Avocado Oil Mayonnaise is 100% avocado oil with a short, clean ingredient statement
- Cage-free egg yolks and no cane sugar in the avocado version
- Widely available, so the clean SKU is easy to find once you know to look for it
What to weigh
- The Classic Mayonnaise, the brand's default and best-seller, is 100% sunflower oil
- Special Sauce, ketchup, and several dressings also use sunflower oil
- Owned by Unilever, and the naming does not flag which products are which
- Easy to buy the wrong jar on autopilot
Price and where to buy
Both mayos run 5 to 8 dollars for 12 ounces, cheaper than Primal Kitchen. The Avocado Oil jar is stocked at Whole Foods, Target, Kroger, and most chains, once you know to look for the words on the front. The cap color differs between the two lines, which helps, but the reliable check is the front label: if it does not say “Avocado Oil,” it is the sunflower-oil jar.
Our Pick
Sir Kensington's Avocado Oil Mayonnaise
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Who it’s for, and who it isn’t
Buy it if
Anyone who will reliably reach for the jar labeled 'Avocado Oil' and ignore the rest of the shelf.
Skip it if
Anyone who wants to trust a brand rather than read each label, the Classic and most of the line are sunflower oil.
How it compares
Against Primal Kitchen, Primal Kitchen is the lower-friction choice because every mayo it makes is avocado-oil based, there is no wrong jar to grab. Sir Kensington’s Avocado Oil Mayo is a touch cheaper and, to some palates, cleaner tasting, but it requires you to navigate a shelf that also holds the sunflower-oil version.
Against Chosen Foods mayo, the two clean avocado-oil options are close on quality and price. Pick on which one your store carries the right version of.
Featured in
FAQ
Is Sir Kensington's mayo seed-oil-free?
Only the Avocado Oil Mayonnaise. The Classic Mayonnaise is 100% sunflower oil, and the Special Sauce, ketchup, and several dressings use sunflower oil as well.
Isn't high-oleic sunflower oil fine?
It is lower in linoleic acid than standard sunflower oil, which is a real improvement, but it is still a refined seed oil. If you are avoiding seed oils, the avocado version is the one to buy.
How do I make sure I get the right one?
The front label says 'Avocado Oil' in large type and the cap is a different color. If it just says 'Classic' or 'Mayonnaise', it is the sunflower-oil jar.