oil light

[kev13]

got abit of a problem with my 2.8 my oil light coming on only so much of the silly buzzer sound i can take

the light will come on when i have done about 10 miles with out fail even if the car has been running for about 15 mins on the morning its -8 to +1 here on the morning.
i can even just jump in it on the morning and it will still can on more or less at the same point

i have seen this is a common problem when looking even with the 2.8 passat but no one says how there sorted it only some people put high pressure oil in seen something about the cluster can be the problem ?

i have did the following
oil level is on the max
changed the oil pressure sensor
cleaned oil pump out was full of bits and sump
pump been checked all ok
fitted new pump got it cheap off a mate thinking old one may have been temperamental
new oil and filter 5w-30 fully syn
put some engine flush oil through it