Bob is a service technician who is well trained and nationally certified. However, he sometimes suffers from the same confusion that all technicians occasionally do - the facts that he gathers may or ...

The lubricant in refrigeration and air conditioning systems has many important functions. Even though the circulated refrigerant is the working fluid required for cooling, the lubricant or oil is ...

Motor oil is an essential element of the engine. It plays a major part in lubricating the moving parts and helps reduce deposit build-up, prolonging the service life along the way. If you don't change ...