Calcium compounds are widely used. There are vast deposits of limestone (calcium carbonate) used directly as a building stone and indirectly for cement. When limestone is heated in kilns it gives off carbon dioxide gas leaving behind quicklime (calcium oxide).
How to Change Transmission Fluid. Transmission fluid needs to be changed from time to time in order to extend the life of the transmission, usually every 30,000â60,000 miles (48,000â97,000 km) (sometimes more â check your owner's manual for service intervals).
Geography. Transmission fluid usually needs to operate between 175 and 190 degrees Celsius, according to AA1Car. In hot areas, such as the southwest, you may need to change every 30,000 miles or earlier. Every 20-degree increase cuts the life of transmission fluid in half.