I think l found a cheap and good way to fix the risk of popping out the rear main seal. I took a oil filler tube and cap from a uplander and l took a one way valve from another equinox. I modified the oil cap to accept the one way valve so the crankcase is not able to buildup pressure but maintains a negative pressure. I used epoxy and drilled a hole right threw the center of the cap with a drill bit slightly larger than a 3/8 bit and l pushed the valve into the hole and epoxy it .the valve is super easy to blow through. Like 1psi and it is one way and is responsible diameter to vent any pressure if the PVC system freezes up let me know what you guys think. Thanks l have pictures attached.