2007 Focus dipstick weirdness

[averageman]

Hi, The finger on the straw analogy is correct, also if you have a look under the car at where the dipstick tube goes into the sump, you can see that the stick reads the level in the tube itself not in the sump, so with heating and cooling of everything and the fact that the top of the tube is sealed and the sump is vented to the outside atmosphere the oil level in the sump becomes different to the level in the tube. I know because I overfilled the oil the first time I toped it up and I suspect I am one of many doofuses.