Liquid Engineering?

I've never quite understood advertising and sponsorship deals. I was looking at the Castrol website for work the other day and I found out that Castrol were the official suppliers of engine oil to the Euro 2008 Championships. Would you be more inclined to put certain oil in your car (or, in our particular case, aircraft landing gear) because they were connected with football? Anyway, at least we now know what Christiano Ronaldo puts on his hair...