Build up of rock solid substance under engine cover

In the past, I was working on a different vehicle, it had a small melted place on top of the piston, had so much crankcase pressure, it blew the pcv valve out of the valve cover and blew oil all over the engine and under the hood. I'm not saying you have a melted piston, I don't know? I would check crankcase pressure.

Remove oil filler cap which is normally on top of the rocker cover look at underside of cap, the side that goes into rocker cover, and if it is covererd in a white oily substance or if the tube that the filler cap goes into has the white gunge in it yo have oil and water / coolant mixing in your engine

maybe the engine needs a good run to burn off the moisture in the oil

Sounds like the power steering pump has failed.
You could take the serpentine belt off and check the pump pulley.

Hello: If you car is a 4 cylinder engine,with the hood open, stand on the drivers side facing the rear of the car, look down, (you may have to remove the top plastic cosmetic cover, toward the end of the engine about midway down you will see a bulge and on the top will be a plastic cover with a nut cast into the cover. (remove it, counterclockwise to remove) The filter is under the cover, it will come out with the cover. It is a paper element type, not the can type that screws on.

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

The white creamy solution is oil mixed with water. Take out your dipstick and check for the same substance, if so, you have a blown head gasket. If not, it's just condensed water in your valve cover that mixes with the oil, witch isn't really a problem. Have a nice day!

The engine will need to be removed (ideally), partially stripped down, thoroughly inspected and all fire damaged parts replaced. Many parts will need thorough cleansing before being inspected and tested. The oil will need to be drained and the oil filter replaced before the engine is refilled. Shortly after restarting the engine and warming it up it would be wise to drain the oil and replace the filter once more to ensure that all contaminated oil is gone. afterwards, she may find that the engine's major mechanical parts have suffered severe wear-related damage to the extent that it's a write-off. Much of the engine bay wiring loom will be damaged and will need to be replaced. The hood will likely need to be replaced and possibly the front fenders, driveshaft gaiters and tires. Some bodywork will need to stripped to bare metal and repainted. The chassis (if there is one) and body crumple zones will need to be checked to see if the metal has distorted or physically altered by the heat (too soft/too brittle).

All of this work costs a lot of time and money and even then it's easy to miss faults caused by the fire, so most cars are routinely sold for their scrap value after such a fire as it's usually cheaper to replace the car than repair it. In any case, it's definitely a lot safer to do so.

let the engine cool down then chip off what u can with a screw driver then spray degreesing oil on it and scrubit with abrush keep it wet then hose off .
good luck Lindz

Spray cold engine down with carb cleaner or brake cleaner. Let air out. Keep watch on where you first see the oil. It is most likely from your valve cover gasket.