Btw, I've made preserved lemons and used Eureka type (best I could tell, from a neighbor's tree and definitely not Meyers) which at the time was what was recommended for the thicker, more durable skin. Various recipes at the time called for either water or oil, so I made a jar of each at the same time. The water ones were ready faster but broke down sooner where the oil ones had more durable texture and lasted far longer. Were I to make them again, I'd go with the latter.
That’s interesting, the methods I’ve used just heavily salt the cut lemons and cover with lemon juice, no water or oil.