I have a 16 hp Briggs & Stratton opposed cylinder, 1980 vintage which just started blowing oil out one of the 2 breather pipes into the air filter and saturating it with oil. I searched the forum and saw that this has come up a couple of times before with different engines and once with another 16 hp Briggs & Stratton engine of the same vintage. The answer was to replace the Breather assembly, but at least in that case... it didn't solve the problem. Before I invest in one, or possibly both breather assemblies at the cost of $26 to$30 each, any other suggestions to confirm that it's the Breather assembly which isn't working? It takes about a minute before the oil start sputtering out - which I also saw happened with another case. I take the dip stick out out and get positive pressure coming out of the tube. Is that normal?

I'm leaving town early tomorrow morning so won't be able to check back for about 5 or 6 days, but thanks in advance for the help.