I also consistently had slightly above "safe" oil levels in my 2011 after 12 quart oil changes. Oil analysis revealed zero fuel dilution. Discovered leaving the dipstick out overnight resulted in lower oil level readings the next morning even with truck not driven for days. Assume the dipstick helps retain a higher level of oil in the tube? Anyway, manual states that 10 quarts brings the oil level to the bottom of the fill range and 12 quarts to the top. I now only use 11 quarts during a change which brings my level to about 5/8 full on the stick. Seems I never get the same exact oil level reading even though I check it with my truck in the same garage spot and not driven for days. Oil filter syphon as stated in thread? I asked the tech that did my sample test about 6.7 fuel issues and he only had a few with fuel dilution. And they were all well below 5% which is the manufacture's tolerance for fuel dilution. So maybe not as big of an issue as you might read about.