I suspect this has been addressed but I can't seem to find anything when I search. I used to change my oil on my past BMW's at the end of the season and then again in spring after the oil sat in the bike sat for 6 months. I got a new BMW R1200RT last year, and last fall I hit 6,000 miles and the oil was changed during the 6,000 mile service. Now that 4 quarts of oil cost nearly $80 I'm (using the BMW oil), I'm hesitant to dump the oil that has maybe 400 miles on it even though it's 6 months old. The manual simply says every 6,000 miles for oil changes, but all auto manuals I've read have both a mileage and period of time for required oil changes. I have to believe that BMW knows best. Any thoughts or knowledge out there regarding this issue. Thanks, Don