What is the best way to get all of the old oil out?

When doing an oil change, what is the best way to get all of the old oil out of my early 850 since I have an inline anti-sump valve? I also have a spin on filter. I am able to get most of the oil out but what is left in the lines sort of contaminates the new oil.

I like to run an oil change with a lighter grade of the same brand and type of oil I'm about to change to, through the old filter. Take it around the neighborhood gently, 10-15 minutes.

Then, drain it a second time, change the filter, and fill 'er up with the final new oil.

Don't disturb the anti drain valve oil lines unless you re-prime them with fresh oil before restart, you can remove the oil filter, drain it and replace as long as you can live with a possible leak past the rubber gasket which may not like being disturbed or destroying the filter which always seems to be the only way to get it off. .

I have always felt that the proverbial 'tea cup full of oil' must remain in the crank when oil-changing as per the book.

For this reason, I always leave the oil filter off after an oil change, overfill the oil tank and start the engine. The dirty oil from the crank and oil lines gently dribbles / runs out of the filter housing and it is easy to see when it changes colour to fresh. It doesn't take all that much oil.

Provided that a careful eye is kept on the oil level, I can't see any problem with this practice.

In order to get the oil tank completely empty if you're not removing it (which I would recommend once a year), it is necessary to pull the bike over quite steeply and then use a clean absorbent rag through the strainer opening