Generally oil extractors draw from the dipstick tube, not the filler opening.  Regardless, using an oil extractor is preferred over all other collection methods as well as drawing out the sample immediately after engine shutdown.  Here's how:

• Make sure your extractor is clean and dry
• Bring the engine to operating temperature and shut down
• Inset extractor tube so that it's about an inch off the bottom of the pan
• Draw out a few ounces and discard
• Draw out your 2.5 oz sample into a clean non-metal container or directly into your sample return container.
• After the sample is drawn, you can go ahead do your oil change if this is your intent.

The idea here is to get contaminants as evenly suspended as possible, to draw from the suspension, and to minimize sample contamination.  Drawing from the bottom of the pan, from a cold engine, from tipping the filter, etc will not give the best picture of what's going on.

Dave. I use to work in a predictive and preventive maintenance program and we did oil analysis as one of the programs. The one thing you want to do is to take it the same way each time. I would do it just as you got done running the motor and draw it out of the dip stick tube. If you only do it once a year it is fine. What they will do is give you a particle count and what metals they pick up. What you want Is a trend from year to year. Hope this helps

Before I change the oil but after the engine is warm I:

*Unscrew the brass cap on the oil sump drain hose.

*Take the hose out of the metal bracket and tilt down into the bilge and into a capture cup.

*Take about 3 oz of that, to clear the hose, then set that cup aside.

*Raise hose when done filling cup and oil will stop

*Grab your oil sample cup

*Tilt hose down fill it with what you need

*Proceed with regular oil change

*Send sample off to Blackstone...