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).
If you happen to drive in severe conditions (hot climate or lots of stop and go driving) or tow heavy loads, you should change the fluid more often, perhaps every 15,000 miles. Doing so ensures that your transmission is only working with the best fluid.