'99 5 speed trans oil change, why not fill to overflow? why -11mm??

[old911doc]

I’ve filled my three Boxsters, my 911’s, and every other manual-transmission I’ve ever had, for 50 years, to the point of overflow, and I’ve never had a problem from overfilling. No oil leaks at the input shaft or output shaft(s) , shift shaft etc. ever. I’ve seen gearboxes that died painful deaths from too little oil. The extra 11mm oil level will make very little difference as the oil is sloshed by car movement, stirred by gear movement, etc. I’m mystified why Porsche makes that suggestion.
11mm? Not 10, not 12mm?

[Stl-986]

Originally Posted by old911doc

I’m mystified why Porsche makes that suggestion.

Well, they are the engineers and that's what they determine to be correct so why put in more then what is specified?

Would you fill you engine with oil till it came out the fill cap or just go by what is specified?