Hi. I have a 1994 Caterpillar 3208TA marine engine. The engine oil was not changed for many years and was very contaminated. I changed the oil several time along with the oil filters. The oil is now clear but would it help the engine to add Sea Foam to enhance the cleaning and lubrication of the engine? The engine takes 16 quarts of oil so how much Sea Foam would you recommend to be added to the crank case? Thanks!