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I'm thinking your improvement is from having slightly thinner synthetic oil put in and the new oil filter. I don't really know how much hp an oil pump uses but pushing oil through a clean filter has to use less.
Even if your new oil isn't synthetic odds are it is still slightly thinner at higher temps than the old 10w40.
I run shell rotella T 0W40(diesel oil) in my ATV, its the only rotella T that is full synthetic, it might be available by special order through your mechanic? It says on the jug that its made for extreme climates like Canada but I'm sure the Alps can get just as cold.
Ian
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