Car is the Mercedes W202 C180 in my sig. Highway driving, no short trips, cold start temp is not a concern. Sometimes you just stare at your stash and can't decide. I plan to run it for 10k km (6k miles) again. Most popular vote wins. Total Quartz 9000 5W40, Total Quartz 7000 10W40, Shell HX7 10W40 (SN+), Shell HX5 15W40 (SN+), Vavoline 20W50 (reluctant to use it, probably diluted with something else).