Synthetic Oil good or bad?

[beetle1303]

Hi, my engine is a mild 1776cc T1.
Stock 1600 dual port case
Stock (69mm)crank-rods balanced for 10k rpm
Engle FK110 (284 degrees if correct)
Mahle Pistons/Cyls (90.5mm)
044 heads
Autocraft style Bugpack bolt on rocker shafts
40mm dual Webers
NO taping/drilling>>no full flow
NO Breathers
Stock element oil filter
Stock doghouse oil cooler
Petronix Ignitor +Coil
electric fuel pump+ 3 fuel filters
Custom exhaust made from kadron 4-1 header, a Group N muffler and some bends.

Gearbox is the original 1303 1300cc one. I ve toped 160 km/h @6.2k rpm
Usually i drive the car hard on the streets, drifting in roundabouts and trying to beat the ricers when possible
I change the oil 2-3 times per year. Consider that the car is driven only when im back home, like 5 months/year