Is there that much of a difference between the different engine design that lubrication wise would be different. If not, we could learn off of the those manufacturers who recognize the latest benefits of oil for what they are. For instance, Honda seems to recognize that 10w30 is more stout than other manufacturers. They don't worry about increased oil consumption like others do. And then there oil meets the latest API rating. Likewise, Briggs and Stratton, so far, are the only ones who recognize the real benefits of synthetic oil and the use of them.