Please help checking the fluid level , unscrew cap ,wipe prong, place the cap back without screwing and this will give you the reading? Have I just done it wrong? Should the cap be screwed back in place to check , if so I have overfilled ?

Always wondered about this as well but I assume it is measured when screwed in, it's only a few mm. difference and there is a max & min mark to go by so anywhere in between is ok.

Aye its at the max when unscrewed so I could take a little out just to be 100%