On another website, the guy says that numerous OM617 owners have changed valve cover gaskets numerous times to stop oil leaks, but the oil leak from the valve cover gasket keeps on coming back. He says the solution to the problem is to modify the valve cover to permanently stop the oil leaks. He said he will not be tell us how to install a valve cover and assumes that we already know how to do that. For a small price, I can learn this secret valve cover modification.

What can be modified on a valve cover? Won't any modification just cause more leaks?