How much oil do I need to capture for an oil analysis? What do you suggest putting the oil in? Where do you send it? How much does it typically cost? I've been running Amsoil S2K 0W-30 all winter in my 2001 Jeep Grand Cherokee 4.7 V8 and I'm kinda curious how it held up. It has a tad over 8,000 miles on it and I just don't feel comfortable going any further right now. I'm in Michigan currently and the winters are pretty harsh. Thanks in advance.