My 1995 BMW with 233,000 miles will be driven only 1200 miles this year. I changed the oil and filter (Mahle filter and 10w/40 Pennzoil HM)in November 2013. Car was hardly driven during the winter months. Planning to change the oil/filter again this November with the same oil/filter. I think that is adequate to remove moisture etc. or should i change it more often or extend changes?