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A plugged pcv system will cause excessive oil leaks. But it sounds like you have a massive leak. If the passenger side is leaking behind the timing cover there may be up to four seals that may leak.single cam motor will have one cam seal dual will have two cam seals. Crank seal and possible oil pump seal. Would recommend pressure washing motor, go to local parts store and get some engine dye. Then support car and let engine get warm. And try to pinpoint leak.
The Chrysler minivan products all had leaking problems. I have had 5 or 6 different Dodge or Plymouth minivans from 88 to 99. How bad is it. The most common thing is Valve cover leaks. Front and rear seals in the engine leak as well as the oil pan gasket. If its leaking a little bit at a time open the hood and look at the front and rear of the engine. Do you see grease and oil that has gone down the sides of the engine? Do you see a lot of grease on the engine with some clean streaks going through it. You may be able to see where its leaking from. If you know someone that knows what their doing have them change the leaky gasket/s. If not you can probably have it repaired for less than buying another van unless other things are seriously wrong with the van.
Hope this helps... Dale
Go to your local "wand type" car wash. The high pressure will work well to clean the oil off. Be prepaired to get dirty. Let the engine cool down for a few minutes then raise the hood and clean the engine as well as under the car all the way to the back. Let it dry for a while. Start the engine and watch for the leak (s). You may have to drive it some to find to find it but don't drive to far between times you stop and check for the leak or you will have to clean it off again. If the leak is as bad as you say I would look at the front & rear main seals or the oil filter first and then the valve cover.
Add about 2.5-quarts of new engine oil to the engine.
Remove the passenger-side wheel, and support the car on jack-stands.
Start the engine and look for oil leak.
Chances are leaks are coming from failed oil-pan gasket or the drain-plug.
The head-cover gasket could be failing as well..