I drive my car about 8km's to work and i am in very similar position.
I do need it often during the day for mainly short trips though and riding is not really going to cut it.
The oil that has given me best results has been a semi syn Penrite.
In my other cars I had oil pressure gauges and that oil was more consistent when motor got hot and the pressure was built up very quickly as to when the mechanic uses his Castrol stuff.
The oil light in car also goes out very quickly.
The motor 300tdi does not seem to use much oil at all though!
I change every 5k km's though regardless.
My way of bonding with the motor



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