I recently received a case of various quarts of motor oil that are unused, yet probably over 10 years old. Does anyone have any suggestions how to use it? Most are 10w40, which is not suggested for use in my Nissan and Toyota. I have considered using it in my lawn mower. Also, can it be mixed w/ gas for a two stroke? Or, should I just drop it off at the store for recycling? Thanks for the feedback.