Thanks Geoff,
Have had no further problems with this since following AVB's advice. I guess I am too use to old machines that you either filled to the point of overflow or checked with a dipstick once and a while and got a fairly accurate reading. I was a bit puzzled when I got this mower and suddenly found lots of bizarre readings. First time it happened I was sure I must have overfilled the sump. :-)
Cheers
