Dipstick (the one that slots in the engine, not the one that owns the car), is a separate entity to the filler cap - it just happens to slot through the filler cap and into the sump, thanks to the cars design.
So... check the oil with the filler cap on. Remove filler cap... pour in some oil, then re-fit. Slot dipstick back into the offending orifice in the filler cap, then pull it back out to recheck the level in the sump.
Nope, not rocket science, but I don't think I have that engine, I have a normal dipstick going into a normal tube with now sign of any kind of filler cap. Maybe I'll just leave it till I buy the haynes seems to be a lot of variations on the engines and no two are the same :(
Nice one :), didn't get chance to look when I got home tonight so it will have to wait till tomorrow. I have a feeling I've found it though... not the dipstick tube think the engines a different one to that.
Some versions of these Peugeot/Citroen engines had the dipstick built into the oil filler in front of the engine, others had a filler cap in front of the engine and a separate dipstick tube at the back of the engine - just depends how the people at the factory were feeling the day your car was built ;-)
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