This is missing the other avocado trick: You can put citrus in tight proximity to a cut avocado, or guac, or avocado mash to halt oxidation better than oil. I

This is missing the other avocado trick: You can put citrus in tight proximity to a cut avocado, or guac, or avocado mash to halt oxidation better than oil. It won't really impact avocado but it will effect guac/mash - it will make your guac mushy and overly acid/citrusy, but it is possible to adjust for it, under-adding citrus to your batch when first making it, by reducing the liquid content added to your guac, and straining with a fine mesh strainer it to purge the extra citrus juice. It is also possible to replace the citrus with vinegar if you prefer using vinegar for your guac instead of lime juice.