Vaseline can be used, but it does not have the properties of being tasteless and odorless.
KY Jelly is water soluble, and could become dissolved in the beer.
It also dries over time, and would not be a good choice.
Generic keg lube is usually one of two things, silicone compound (grease/lubricant), or petrol gel.
The differences between silicone compound and petrol gel are the price, and some of the properties.
The price of petrol gel is about 6 times less than the price of silicone compound.
It states on the Petro Gel label that it is U.S.P. Mineral Oil along with other USP ingredients.
They even offer a free sample on the site.





