The contact owns a 2014 Chevrolet Equinox. The contact stated while driving 45 MPH in cold weather, the vehicle was shuddering. There was no warning light illuminated. The vehicle was driven to the work garage, where the contact noticed that a significant amount of oil had leaked onto the ground. A mobile mechanic diagnosed the vehicle and determined that the main crankshaft seal had failed because the PCV system had frozen. The vehicle was not repaired. The dealer was not notified of the failure. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance in covering the repair under Technical Service Bulletin: Bulletin No: PIP5093B. The failure mileage was approximately 86,000.