answer the cost and present economy

1. A diesel engine uses type A filter and a high grade lubricating oil costing P55.00 per liter. With this filter, the oil and the filter have to be changed every 500 hours of operation, and 5 liters of oil have to be added every 100 hours. This filter costs P1480.00 a piece. Eighty liters of oil fill the engine.

Another type, filter B, costing P1200.00 may be used with a lower grade of oil costing P48.00 per liter. However, if this filter is used, the oil and filter have to be changed every 300 hours & 10 liters are added after each 150 hours the engine is used. Which type of filter & oil would you recommend?