If a car is gone down to water you should change all details as quick as possible. Especially it concerns automatic gear boxes. You should change oil three times where it is necessary. If a gear box works with water even three days it will put out of action. An engine with mechanic gear box is more supportable to water.

Nevertheless it is necessary to remove water from it and change oil. Oil filter should be changed too. You should take spark plugs off engine pour 100 grams of oil and roll it several times. If the car was in water do not turn on spark while commutator, block emission control will not be taken off taken to pieces and dried. You should also take car radio and tape recorder and dry them. You can use clean ethyl alcohol. After saving car you should change oil in all electric engines the same should be done with the starting motor and alternator and in all bearings. Besides you should pure water from all petrol cistern and dry signals. It will be better if you do it as quickly as possible. Car components which were in water can not be reliable. That is why you should take preventive measures.