I do not recommend pouring sample oil into a container and then pouring back into oil filler, I swear the dirt just jumps in the oil under the car. Everytime you move under a car lifted a few feet you bump off dirt without even realizing it.
NO PUMP technique; note I prefer the ease and cleanliness of the pump .
Engine oil at operating temp, protective latex gloves( unless you think your liver is a better filter than your current full flow)
,clean area around plug with isopropyl alcohol and allow to dry (won't take long with hot oil pan). Place a capture pan with low sides to trap initial flow.
Unscrew drain plug, gently and carefully hold in place( if all the nerve endings are burned away like mine it is less painful)
and allow a 20 second stream at least 1/4 in. dia. then fill sample bottle. Reseat plug by hand, being very careful not to contaminate open sample bottle, immediately cap bottle and place out of way.
Retighten the plug and rock on. Did it this way for years and after a while you become quite good at the technique.
The more careful you are the better the sample. Use clean rags to wipe down things, not one that has wiped 100 different surfaces and has residual oils,greases, water,glycol,detergents etc.
BE CAREFUL, HOT OIL HURTS.
A note for those who use any of the myriad valves available, especially bypass ports or valves... DONOT take the first oil that comes out there will be crap in there that will make your oil look worse than it really is. Always allow a stream of clearing oil up to 20 seconds or until the oil looks representative of the sump.
[ January 21, 2003, 05:27 PM: Message edited by: Terry ]