You should have the oil and filter changed every 30,000 miles or according to your owners manual. Oil and coolant leaks Look around and under the engine and transmission area for any sign of leakage. Seepage and minor leaks may not be worth repairing, but at least you will have a good idea as to the problem if it gets worse. If you find a coolant leak, it should be repaired as soon as possible. This not only will save a breakdown but is an environmental issue as well.
Battery Make sure that the top of the battery is clean.
A battery can lose its charge if there is dirt between the positive and negative posts. If there is corrosion on the battery posts this needs to be cleaned off. Baking soda is the best thing to break down this corrosion. Mix some with water and brush on with an old paint brush. Then thoroughly flush with water until all the corrosion is gone.