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).
Should you swap out the fluid every few thousand miles, or wait until you've driven 30,000 miles or more? My owner's manual says I should change the transmission fluid every 30,000 miles, but my father swears it should be changed as often as engine oilevery 4000 to 5000 miles.