Travelling down the M62 yesterday a reasonable speed  ;) and the MID flashed a warning  check oil level. I knew the oil level was OK because I checked it before I set out but I still pooed myself because I was trying to work out where all that oil had gone in a 340 mile round trip. After driving the last 40 miles like a Sunday driver I arrived home and let the engine cool for a couple of hours before checking the oil level which was O.K. Can anyone tell me if the gearbox oil is linked to the display or is it likely to be a faulty sensor?

It will be sensor related (autobox level not measured). Sensor is bolted to sump, might just be shitty connectors that need cleaning (tends to get a bit dirty down there).

Also, the low oil warning tends to come on if oil level slightly below halfway between min and max....

I had this for a while. Typically at 70-80mph uphill on the M40. In fact, this was the only place  it ever happened. Actual oil level was normal. It stopped occurring after I changed the cam seals and cleared the breather pipes.

My theory, for what it's worth, is as follows:

• The oil return channels on the V6 are marginally too small by design
  If the breathers are blocked, oil return to the sump is further retarded
  The oil level sensor is in the front half of the sump (????)
  If you run the oil pump flat out (eg high speed, uphill) you will starve the sump momentarily
  Hence the false alarm
  

The problem with false alarms, of course, is that one day they are real. So don't entirely ignore it.

Cheers
J