My wife's 1991 Civic is leaking oil through the air filter box. What may be causing this and what can I do to fix it? It has a 1.5L and is fuel injected.

Thanks, Rick

 

pcv system...oil is coming in the hose attached to the intake. try a new pcv valve, you may have to build a catch can if you have excessive blow by

 

You should also go ahead and replace the hose that goes to the pcv valve. Aside from my pcv valve being completley clogged, the hose had collapsed in on itself.After changing those out, my oil consumption has reduced quite a bit. Good luck.