The main problem with the 1.8t engine is sludging from using the wrong oil or waiting too
long between oil changes.
The system checks for oil pressure at 2000rpm. If it does not get a ground signal at that
rpm, then the oil warning will come on.
You need to attach a mechanical oil pressure gauge in place of the oil pressure switch to see
what the actual pressure is once the engine is fully warmed up.
A scan tool can be used to access the instrument cluster to view oil pressure switch status.
If less than 30 psi of pressure is present at 2000 rpm or above, remove the oil pan and
check the pickup screen for sludge / restriction.
Friday, May 4th, 2012 AT 4:50 AM