So if he drained out 1/2 litre and you were still 5 mill over the full mark, I don't think there will be any long term damage. I wouldn't worry about anything under 1/2-3/4 a litre overfilled.
I don't know about the 3.0r's, but I know the dipsticks on the 2.5's are funny. One side of the dipstick will read as much as 3/4 litre higher than the other side from my experience.
It looks like the total capacity of the 2009 3.0r is 5.5 litres, so my guess is that he added 6 litres of oil, and there was probably a little residual oil in the engine to maybe bring the total up to 6.2-6.4 L if I had to guess.
*Doing a little extra research to see if anyone possibly knows what the overfill tolerance is on the 3.0 H6, and I haven't found the answer yet. But I did come across people saying that the dipsticks on H6's are just as bad as on the H4's, must be a horizontally opposed engine thing.
Last edited by apexi; 02-05-2015 at 11:55 PM..