The leaves are falling and living in Philadelphia thoughts turn to putting the car away for several months. Considering this earlier this year, I checked my oil change frequency and was surprised it had been seven years since the last change. I only drive about 100-150 miles per year, use red line oil and a K&N filter so I didn't even think about it. So I put a post on www.bobistheoilguy.com. They jumped all over me saying....1. Oil should be changed every year regardless of the mileage 2. If you decide to change every 2 years have a used oil analysis conducted. 3. Because I occasionally idle the engine to warm it up, they advised against it unless I run the car at least 25 minutes to warm up the oil to prevent condensate. I called the engineering staff at Red Line Oil to confirm that the ZDDP concentration is sufficient for my engine, determine if the oil is date coded and determine the life of additives. He agreed with the above recommendations saying I should change the oil annually every year, that it contains sufficient ZDDP, that their product is not date coded. A friend's father worked on the development of Mobile 1 and he said additive life is important. The gentleman at Red Line Oil did not mention additive life but if they do not date code, could it be significant? I think a used oil analysis is only about $25 so maybe I will go that route next year if I can figure out how to interpret the results. What do you do?