OK, I have to admit. Sometimes I thrash her a little. I've even been known to bounce her off the rev limiter
But seriously, check out the workshop or owners manual (page 192). 0W-30 to 15W-40 and everything in between is within Honda's recommended specs. You pick depending on ambient temperatures.
I know you know this. But for those that don't.... that first number before the W is the viscosity at low temp on start up.
That's in the morning, when she's been sitting overnight and the engine is stone cold. Most of the oil has trickled down to the sump overnight. And there is only a very thin layer clinging to the moving parts. That's when they say most engine wear takes place. That's when I want the oil to flow as fast as possible, and protect the engine in those first few minutes as she's warming up. That's why I pick 5W. I can even see the sense in going down to 0W if you live in a cold place (this would be overkill in Brissy).
3 minutes after start-up, she's at normal operating temperature. That's when the second number kicks in. 30 or 40 or whatever you run. Both 30 & 40 as a second number offer pretty good protection at normal operating temps for this type of engine. At normal operating temps the oil pump is providing a healthy film of fast flowing oil, and those metal parts are gliding over each other with little to no contact.
That's why I run 5W40, but would probably (happily) run 5W30.
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