I have a somewhat bizzare problem, which is that my dipstick doesn't read accurately anymore. I seem to get a long thin trail up about half the length of the dipstick, instead of a nice solid reading at the bottem where it's supposed to be.
I'm pretty sure this started when I got it back from a shop in the summer, I'm afraid they may have overfilled my engine oil? Anyways, when I did my own change last month, I let it drain a long time and very carefully filled to what the engine + filter capacity is. The car has never burned oil, so I'm not worried about the level getting low, but I would prefer to have a functioning dipstick.
Any thoughts on causes / cures?