5w30

ChrisD46, I just noticed in your signature line that you mix 5W30 and 5W20 in your '10. How long have you been doing that? How does it work? Have you done a UOA? Interesting.
 
Been running a 50-50 blend of 5-20/5-30 in our beater car. No testing, but my general impression is that it runs quietly and still gets 30+ mpg...
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