Yeah this might be the case as if I fill it to max when stone cold then run the car and measure within 5 mins or so of stopping the engine, the oil will read very low towards and below min. Top it up to full at this point and when cold for some time (days/week or so) it will read 5/6mm over max. Not bothered just want to make sure the right dipstick is being used and the engine isn’t being forced to breathe heavy.