Hey guys, I change my oil quite frequently, and it has always been my intention to send in some samples for analysis. But since I didn't have any kits at the time of my oil changes I just filled up a couple empty baby food jars with used oil and sealed them up. The baby jars were clean, and I took a mid-stream hot sample as I was draining the oil from the oil pan. I have a Castrol GTX 5w-30 sample and a Havoline Synthetic 10w-30 sample. Both have been sitting in baby jars for a couple months, and I probably have much more oil than the sample kits need. So how do I go about getting a good sample from these filled baby jars ?. Do I need to warm up the fluid and give it a good shake before I put the oil in the sample kits ?, would that help any?. Anything else I can do to get a good representative sample ?. Any info would be great. thanks.