I have a Rigid Pressure Washer RD80746, it has been a good one, it is time to change the oil and the cat pump oil. Being a first time pressure washer owner I want to make sure I am putting things in the right place. This pressure washer is equip with a Subaru engine. I am familar with where to drain the oil, and have done so, however I am perplexed as to why the engine features 2 deep sticks in a V pattern across from each other up near the cat pump, unless one is for the cat pump. I do not see anything marked as a drain plug on the cat pump. I have consulted the manual and it says the motor takes 20 oz of oil which seems like a bit much, but it may be true. I do not see anything on the amount of cat pump oil it requires and the filling and draining procedure. Can anyone point me in the right direction?