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).
Automatic Transmission Fluid and Filter Change. Changing the transmission fluid on the Cayenne can be a daunting task for the do-it-yourselfer. It involves a few complicated steps that can be potentially dangerous. In theory, you should consider changing both the fluid and filter every 80,000 miles. This helps to preserve the life of the transmission.