Please Gents, can anyone tell me the required amount of oil to fill this pressure washer? Thank You Kindly

1 or 5 what ever is worse rating that's the rating I want to give this product. I have a defective control head in my K 2.19 washer but instead of just allowing a customer to buy the control head housing as they do with many other models. Karcher wants to sell you a whole manifold with all the internal pump parts which I do not need for $96.53. I only paid $99 for the whole unit from Walmart. Karcher tries to force you to buy a new unit and throw away the old unit. What a waste of our resources. All the other parts are good but economically the only sound decision is to toss the old out. Karcher you should hang their heads in shame.