A904 Leaking thru speedo

Run it in neutral first for a minute right before you pull it, and you should get less than a cup.
If you jack it up in the back even less.
Yes I was thinking of jacking the rear up so thanks for confimation of that. Running it in neutral prior does what? Replacment will be slow since I will have to replace that internal seal held by the clip. Will I have time to tak advantage of that temporary run in neautral?