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 you change transmission fluid may be more use dependent then motor oil. This is one item I would err on the side of caution. Though many change their transmission fluids every 30 k, at least with cars I own, halving their rates to 50 k or a little less for vehicles with heavier use seams reasonable.