I've used the Ultra-pure slide grease on my double horns for about a year now ( with 10 slides per horn, a long-lasting and smooth feeling slide grease is the answer to a prayer) but I hadn't used the oil much until earlier this week.
I purchased an entry-level flugelhorn from WWBW and expected the worst. The valves and the third valve slide felt 'graunchy' when I received it until I totally cleaned the flugel and relubed it with all three of the Ultra-Pure products.
Man, what a difference! I don't know if Ultra-Pure is the best break-in oil, but it doesn't matter, that's what I'm going to use.
