The last time I had my oil changed was at the dealership in April (4 months ago). Since then, I have put about 1,000-2,000 miles on my car. The oil life still says about 80%. I should also mention, I do not know what type of oil was put in my car. My wife had the oil change done. I also have a bottle of PP 0W-20 in my garage with a Purlator filter waiting to go in the car. My question is this, when should I change the oil? Should I wait for the OLM to tell me I need a change? In other words, should I change the oil when the allotted miles are up? Or, should I change it after a specific amount of time. I hesitate letting oil run in the car for more than 6 months, especially since it gets pretty cold in Wisconsin. This oil was changed right after winter in April, so its not gotten that harsh winter yet. One more relevant fact, I drive my car virtually every day. And I drive 4-10 miles per day.