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Good stuff, gpshumway. I appreciate your passion about motor oil. WRX/BRZ. The boxer engines give everyone a chance to get serious about the motor oil situation. Having been banned by from bitog by Granny in the Ozarks, I treasure the priviledge to talk about motor oil here.
I used Sustina 0W20 for 60k hard miles and conducted plenty of used oil analysis. Rest assured, I don't judge oil by it's color, smell, taste, or marketing. There are lots of pretty bottles out there.
Sustina shows a little initial shearing. Then it really stabilizes. There was some oxidative thickening between 17-19k miles. The flash point was at threshhold at 20k miles. The TBN/ TAN ratio was not alarming. Wear numbers looked very good. I enjoyed noticeably improved performance over all other oils, including TGMO, which is slightly thicker.
My basis for claiming that Sustina runs clean is this: I immediately followed up my 60k mile run on Sustina with a fill of Pennzoil Ultra SN 5W30. This oil is GTL and has a boat load of calcium. It appeared pristine for 12k miles, indicating there was nothing to clean.
I am fascinated about motor oil. As a mere consumer who happens to drive 100k miles a year, I enjoy to share and listen. The truth about motor oil, latest advances in motor oil, these are things I can't get enough of.
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