Oil Change twice yearly? With Low Mileage

[Boxster33]

Hi All, I purchased my 2000 Boxster S in March 2009 with 34,000 and have been enjoying the summer so far. No issues.

My question is, this is my daily driver but I'm only putting 600Km per month (I work fairly close to my home). Rather than changing the Oil once a year I'm thinking about changing it every 6 months regardless of the mileage. What do you think?

I plan to do drive the vehicle April to December and store it the other months.

Decisions
- to begin using Motul 8100 5w40 on my next oil change
- Using Shell Gold 91 octane 0% Ethanal, found better gas mileage than Sunoco
Gold 94 Octane with 10% Ethanal


Hack I've done so far

- Changed the Cig Lighter from euro style to US
- Added Ipod connectin to the Becker stereo

Happy Boxstering!