The Castrol edge 5w40 in my Can Am Maverick is going on 2 years in the crank case. Less than 50 miles on the oil as we just have not used the side by side much lately. It mostly just sits in my garage. I have taken it out for some short putts but that's all. Like I said maybe 50 miles max on the oil. If the weather holds out we may take it out for a few hours tomorrow. I'm seriously thinking of changing it after tomorrows ride. Or leave it? Does time effect the oil filter in any way? Make the paper brittle?