Perhaps one of the best atributes of a message board is that the sum of the whole is greater than one or a few.
In otherwords I was hoping for some help in understanding, but if your going to make me do all the work...
An extensive Google search using "thermal expansion of oil" yielded this:
Thermal expansion of oil is approximately 1 cu in per gallon per 10F rise.
1 U.S. Gallon = 231 cu. in
So lets set up the scenairo: 50F ambient with oil temp reaching 200F (engine coolant and oil temps are usually within 1F)
equals 150F rise or 15 cu in per gallon or 6.49% (15/231)
I measure 18.5mm between the two holes on the Insight's dipstick. Therefore the rise on the dipstick is equal to 1.2mm or an increase of about 1/15th of the total distance.
Difficult to see and a minute "overfill" factor.
Guess my anality is showing a bit afterall. <VBG>
Nor can I use my standard HTH in closing. And unless someone can provide some hard numbers rather than anecdotal observations I am still of the same convictions. Overfill at these "levels" can do no harm nor damage and can "theoretically" (extremely remotely) be "benefical".