Transmission fill - 11mm below the plug? Why?

[Htci]

I refilled my ‘04 986S manual transmission to the fill hole over 20,000 miles ago and have not experienced a single issue...first time I’m learning about this. Even in light of this information, I don’t plan to empty any fluid.

[JFP in PA]

Originally Posted by Htci

I refilled my ‘04 986S manual transmission to the fill hole over 20,000 miles ago and have not experienced a single issue...first time I’m learning about this. Even in light of this information, I don’t plan to empty any fluid.

The six speed is filled until it overflows, the five speed is filled to 11 MM below the plug hole to prevent oil from getting on the clutch through the throw out bearing collar if it is filled higher.

[Vtx531]

Originally Posted by JFP in PA

The six speed is filled until it overflows, the five speed is filled to 11 MM below the plug hole to prevent oil from getting on the clutch through the throw out bearing collar if it is filled higher.

Guess that answers my question... oil on the clutch sounds bad.

I hope I got the level right. I used a white paperclip and made a mark at 11mm with a fine point sharpie. Hard to get it in there because it seemed like there was stuff inside and you had to get the paperclip in just right and not touch any other parts on insertion or removal. Seems like there has to be an easier and more precise way. Overthinking this I’m sure.