Greetings. What happens if you're over on your oil fill by a quart or two? Does it cause oil to burn? I get this crazy smoking thing going on when I pull my 30 trailer at 60mph or so. With no trailer all seems fairly well but I can still smell an oil burn of sorts and nothing comes out of the tailpipe. Only other thing I can think of is that the rear drum brake shoes are rubbing on the drums slightly and smoking (the smell of that's not much different from the smell of burning oils).