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).
Our recommendation: A conservative rule of thumb is that a car should get a transmission fluid service every 40,000 miles. If you notice any fluid underneath the car, get it inspected as soon as you can. Changing your transmissionâs fluid regularly will greatly extend the service life of your vehicleâs transmission.