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There seems to be 3 different Yamaha valve oils:
YAC 1000 came with my horn, works fine
YAC 0900
YAC 1100

I purchased some more, it came in a 40ml blue & clear bottle, I don't know if it is the 0900 or 1100, but I like it better than the 1000.

what exactly were the problems you had with hetmans? I looooove that stuff!

I went the other way, used the yamaha premium valve oil which came with my 642 euph for a year, then switched to Hetman's. Both work fine for me. No yellow with either.

John

I've noticed that the best oils (i've tried a bunch) for my 642 are (in order best to worst)

Hetman's #1
Yamaha that came with it (blue and clear bottle)
ProOil Hybrid

Other than those, all other oils seemed to not work that great. YMMV

I use the Schilke slide grease and Hetman's #2 and haven't noticed any coloring problems. And Hetman's is by far the best valve oil I have ever used. It is odorless and one good application does my horn good for a couple of weeks. The only drawback I have with it is the eardropper applicator, which I have read here that they are working to improve. Then it will truly be valve oil nirvava!

Thanks for sharing the observation about the Hetman's grease though. I wasn't aware of the problem.

yup

tubafreaks7 wrote: I guess my question is; Does it realy matter? Valve oil is valve oil....Isn't it?

This is absolutely a user specific question. Many people say no, oil is oil. And if every oil works the same for you, then great! Buy the cheapest, save money. But for some people, myself included, they do make a difference on certain horns. I've noticed this, and it is definitly not just a placebo thing.
In general, newer horns or yamahas (or newer yamahas) are most oil picky. They have very tight fittings, and for some reason the yamaha alloy doesn't like certain oils.
And no, valve oil (technically) is not the same. Different types usually have different formulas, although many are pretty much the same type of formula.

bloke wrote:Properly-functioning valves really aren't at all "picky" about the brand or type of lubricant, as long as the lubricant is somewhere in the viscosity "ball park".

So, Joe. What do you use for slide grease? --paul;