BMW is looking at a new way to extend your oil change intervals. No, it's not by claiming your motor oil is a lifetime fluid; there's a real method to this madness. The CarBuzz research team has just uncovered a patent for an air-oil separator that would help extend the life of your engine's oil.

 

Even better, it could also help stop carbon buildup on the valves, maybe saving some poor, innocent walnut shells from a trip through your intake tract.