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Old 26th February 2019
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The evidence suggest that a possible quart could be left in the sump when you add new oil.
In practice, you've run the bike for about 30 mins. before doing an oil change.
In theory, most of the solids are suspended within the oil and carried to the tank.

That doesn't mean all of the solids are in the tank.
And with the tank drain above the bottom of the tank, solids will still be present in the tank.
This will also not drain oil from the feed lines to the engine.

Removing the case plug on Evos won't work.
The Evo case drain will not drain the sump as the drain hole doesn't enter it.


Therefore, there will be a certain amount of used / old oil that will stay in the system and will mix with the new clean oil.
This will also dilute the new oil to an extent.

But using regular change intervals as suggested by the MoCo (not aftermarkets) it will not hurt your engine if you don't scavenge it.

Now this is assuming you don't have anything busted or exploded in your engine.
If so, the scavenge change (among other) would be a good start after whatever has been fixed.
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