How do ya'll get your *oil* when you drain and send in a sample for a UOA. I just sent in my Redline 5W30 / BMW X5 4.4 V8 / 5300 miles the other day. I drain my oil into the oil pan and after I was all done with my oil change, I opened the pour spout out of my drain pan and filled my the OIL sample canister. Just curious to see what methods you use when you send off your sample for a UOA. I know there is probably 1/16 of a quart or less that is still *coating* the interior perimeter of my drain pan from each oil change, after I empty it out. If my next 3 OCI will be Mobil 1 SUV, and I do a UOA.....will the *old oil* that is in the drain pan mixed with the different oil SKEW the results of my UOA to a certain degree ?