I want to change the oil in my newly acquired TTZ. I'm stuck on what to do about oil weight. The last owner ran 15-50 Mobil 1. I use it as a daily driver (6 mi commute) and I get off late at night. The avg nightly low here is ~40* F. I don't push the car much, but I do good warm-up and cool-down times. I think 15 is too thick on those cold nights, maybe a 10? (40/50) Thanks for the advice in advance!
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