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Oil pressure specifications are for an engine at 80*C. Typical specs are: idle = 1.4-1.7 bar (17-23 PSI) 2000 RPM = 2.5-4.5 bar (36-65 PSI)
Odds are a flush is not needed being your at 40 plus psi
Unplug the ABS module and test drive the vehicle. If the oil pressure warning light does not come on with the ABS module unplugged but will come on with the module plugged in, then the most likely explanation is a failed ABS unit. The ABS unit is very common for failing in this Passat and can backfeed voltage to the instrument cluster. This can affect tachometer and oil pressure warning operations.
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