I have the UPR kit on my '17 and get 2 fl. oz. roughly every 5k miles. Love the UPR kit. Goodyear hoses and factory connectors. I did have to trim under the foam engine cover, but who cares. If I remove the hoses and put the trimmed foam cover back on, it looks exactly like stock. The trimming is just underneath to clear the hoses and not visible from the outside. It still sits the same.
On my 19 it didn't require any mod to the engine cover.