This close to getting her wet...

[spareparts]

i haven't used oil hubs much, but the times I've worked on them(salt water use trailers) I've found the if the trailer sits for long periods( 6 months or more), then the seals usually don't seal good and the lube runs out, If the trailer is used on a regular basis, then it keeps the seal surface fresh and clean and the hubs work real good. Remeber also that dunking hot hubs into cold water supposably will pull water in past the seals, i don't know if its true or not, but I've heard it alot. Worse come to worse, just pack grease into the hubs intead of lube, just change out the caps to sure lube type