I would like to know if anyone knows how to get an oil sample without changing your oil. I would like to send a sample to have analyzed. I do not change my own oil as of now. When I bought my truck the dealer gave me 4 free oil changes. so as of now they are changing my oil. Thanks

 

This is way I do it. Plans may have to change if you are using the filter port for a bypass filter.

All from the hardware store. Buy an 1/8" NPT X 1/4" compression valve
(these are common for ice makers and swamp coolers), a 1/8"X3" nipple and
3' of 1/4"plastic tubing. With the engine off but warmed up connect this setup to the plugged 1/8" port on top of your oil filter housing, hand tight no Teflon tape. Start the engine, open the valve and run oil though the tubing into your oil fill spout to flush it
out for awhile. You can now take a sample with great control with the
sample being the only loss of oil. Shut down the engine, open the 1/8
valve to let oil in the tubing drain back then remove it and replace the
plug. If you like leave the valve in place and just remove the tubing.

 

Just wanted to say Thanks. You been a BIG help

 

Oversimplified version:

Loosen drain plug slightly. Oil will drip. Catch oil. Tighten drain plug.

 

Doing it that way the oil will be so contaminated that the sample would be worthless.
Two reasons, dirt and metal debris from loosening the plug will enter the sample. Also you would be picking up sludge from the bottom of the oil pan.
We're talking parts per million here, it doesn't take much to contaminate a sample. Just leaving a sample bottle open for one day will collect enough dust that your silicon level would indicate you had been running without an air filter.

If you must take a sample from the drain plug it needs to be done in about the middle of the drain. That doesn't help much if you are checking to see if the oil is still good to use.