I changed to 5w-30 synthetic (Castrol Edge Sport as it's called in Australia) at my 10,000km service. Can't say about the oil pressure but I would imagine it would be more stable than mineral. Temperature seems to be fractionally cooler but that could just be the engine loosening up, fuel consumption has improved approx 2 litres per 100km on a long run - hasn't changed significantly around town.
Car has now done nearly 24,000km and has barely used any oil - certainly not enough to top up.
Regards,
Jamie
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