I know the low mileage OCI has opinions all over the place but I don't get why this isn't more agreed upon. After engine oil has been put in an engine and run a few hundred miles does it start to break down faster than oil new in an open bottle? If it does begin to break down faster than unused oil does it break down to the extent to benefit from replacement at 6 or 12 months? I know oil has lasted in the ground for millions of years and in sealed bottles for several years just fine but that doesn't apply to oil that has seen a few hot/cold cycles and been introduced to the combustion environment. I guess I can do an oil analysis at 6 and 12 months myself to see how the additives have aged but I would think someone who reads this forum would have done that already.