Hello Sam, hope you are well.
Think I might have overfilled the oil on the S4. I find it very hard to read the dipstick anyway but looked today and decided it was low. I drove the car and got it up to temp and then shut it down and left it for 5 -10 mins, then checked the dipstick. It was on the lower mark of the hatched area on the metal section between the orange plastic ends. I put half a litre in and now its above the orange plastic part.
I,ve seen an oil extractor in Argos, is it possible to extract oil through the filler cap with a tube or can you only do it through the dipstick tube.