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).
The severe schedule has differential fluid still changed at 90,000 miles. Transmission fluid is to be changed at 60,000 and at 30,000 thereafter. The manual says that you should use the severe schedule if you are driving mostly under one of the severe driving conditions (not occasionally or sometimes).