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Start by ordering a fix kit. Most people use the V3.4 kit. If you plan on adding a throttle body spacer, one of the older versions will be what you need. Most add the spacer in order to add a boost gauge.
Next, clean off the engine with a degreaser or brake cleaner, carefully rinse it off with a slow flowing garden hose avoiding the battery, fuses and electrical connections. Now locate monitor where the oil leaks are coming from. The usual culprits are the valve cover gasket, the CPASV's, the front crank seal, and if the charge pipe has become contaminated due to long term neglect of the PCV issue, any of the connections for it. Sometimes the oil cooler seals fail as well, but from what I understand not from the PCV failure.
Once you have read some of the threads on the subject you should have a better understanding of what is happening.
Don't forget to introduce yourself and your Cruze here.
This is more than you need hopefully, but these links cover most of the issues related to the Intake PCV failure:
2011-2016 Cruze 1.4 PCV Valve Cover/Intake Manifold Issues
PVC Intake Manifold Failure letter from Chevrolet
Special Coverage - Camshaft Cover Replacement - (Jul 28, 2020) #N202299080
Bulletin No.: PIP5197 - NHTSA
gm service and parts operations - NHTSA
How-To: Remove 2011-2016 Cruze 1.4L Intake Manifold
How-To: GM 1.4L LUV/LUJ PCV Fix Kit V2 Install
How-To: GM 1.4L LUV/LUJ PCV Fix Kit V1 Install
V3.4+ GM 1.4L Turbo PCV Fix/Upgrade Kit - CruzeKits.com
How to Install the CruzeKits.com V3 PCV Fix Kit - YouTube
www.cruzekits.com
Depending on the other symptoms
How-To: Replace the Valve/Camshaft Cover (1.4L Turbo)
How-To: 1.4L Gen 1 front crankshaft seal replacement
How-To: Replace CPASV (Camshaft Position Actuator Solenoid Valve) Seals
How-To: Charge pipe clean - up.
How-To: Change the Oil Cooler Seals
2011-2016 Cruze Limited 1.4L PCV System Explained
