Final answer:
The manufacturer's manual and professional auto repair shops are two places where you can find severe service recommendations for guest's vehicles.
Step-by-step explanation:
Two places where you can find severe service recommendations for guest's vehicles are:
- Manufacturer's Manual: The manufacturer's manual contains detailed information about the service intervals and recommendations specific to the make and model of the vehicle.
- Auto Repair Shops: Professional auto repair shops have access to service databases and guidelines that provide recommendations for severe service conditions.