As i mentioned, I changed to Mobil 1 @ 1000 miles, and I plan to do another in 2,000 more miles, which will set me up nicely for every 3,000 from here on out. I'm thinking that whatever will be affected by break-in and setting-in will be mostly finished by 1,000 miles. Considering how the manual even states that break-in should only last 600 miles IF you chose to do it, i'd like to think that they know what they're talking about.
As for the thunking I mentioned, you shouldn't have to focus too hard if it's doing it. With the radio off and the windows up, I noticed within the first 15 miles that were put on the car. It's only the shifting action that does it...you don't even have to engage the clutch. Once warmed up, coast along and run the 1 to 2 to 3 to 4 shift then in reverse 4, 3, 2, 1. If all else fails, shift between 2nd and 3rd back and forth and you'll hear what i'm talking about.
If yours does do it and you didn't hear it before, i'm sorry to have brought it to your attention. Cause I gaurantee you'll hear it every single time now.