I noticed recently that the 351M in my wagon has started losing quite a bit of oil. Since there's no evidence of a leak, it seems most likely it's burning it. I think it's likely since often quite a bit after startup, when it's running really rough after starting there's often a cloud coming from the exhaust. On these motors, is there a most likely culprit to be the cause? If so, is there an easy fix or way to at least partially mitigate it? Or am I just going to have to deal with it until I can get the motor/heads rebuilt/replaced?