A bit of marine
toilet trivia: original manual toilet seals, valves etc were made of leather--and there are still a few super expensive bronze
"thrones" that still use leather. Veggie oil was recommended to lubricate them because leather absorbs oil. A couple of tablespoons left to sit for a few hours kept the leather soft for months. As rubber, nibril,neoprene and other materials that do NOT absorb oil replaced leather in marine
toilets, people just continued pouring oil down the toilet 'cuz no one had come up with a better way...and still do because veggie oil is cheap
, readily available and pouring down the toilet is the only effort required to use it. And all the commercial
"head lube" products are liquids because they're as easy to use as veggie oil and people have to replace 'em often...A tube of thick grease that lasts for years isn't very profitable.