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).
When to Change Transmission Fluid If you ask around, youâll often get different opinions on when to change transmission fluid. Some car manufacturers recommend getting a fluid change every 100,000 or even 150,000 miles, but that is far too long when you think about it.