Quote:
Originally Posted by RRC
Hi Bruce,
Since you did change oil from 15W40 to 10W30 could you tell how much (%) improvement in FE you noticed only by changing the oil?
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Look in my gas log at the entries around June 10, 2012. My notes tell me that's the date of the change in oil type. Comments there should tell you more.
If you see "MMO" mentioned that's Marvel Mystery Oil. I do measure the amount added to fuel and count it in fillups.