I have excell EXH2425 pressure washer and the pressue just stoped after surging I wonder if the pump need oil or is there a solution by pouring in the winterizer stuff that may relieve corroded parts

SOURCE: What kind of oil do

Pressure washer oil

I took this picture of my power washer so it's easy to explain the oil.
The oil is different for engine and pump.

The pump oil is 20 or 30 weight non-detergent. SAE20 or SAE30 motor oil. The level of the oil comes up about half way. There is a plastic viewport on side of pump ... oil comes up half way on viewport.

The engine oil is 10W30 motor oil. It comes up about half way or a bit more on dipstick.

To remove oil from pressure washer, do not turn engine on it's side or turn engine upside down or motor oil will run into the carburetor. You might wonder how I know that. Afterward, the carburetor needs to be cleaned out.

To remove oil, you can tip engine to the side but not so much that oil runs up into top part ... to remove the rest of the oil, you can use a plastic hose

SOURCE: do you use 4 cycle

For your model pressure washer you should not be using 2 or 4 cycle oil. You need to use the following:

Model # EXH2425 P 2400PSI 2.5GPM 5.0HP HO
PUMP TYPE OIL TYPE OIL CAPACITY

**Annovi Reverberi (XMV) 30W non detergent 13.5 oz.

**Annovi Reverberi (RKV) 30W non detergent 18.54 oz.