Oil For Pressure Washer Pump

[Propflux01]

Anyone know what type of oil goes in pressure washer pumps? Is it the same oil as air compressors, or something different? I came across a bottle of oil for those, but it doesn’t specify what is special about it VS any other oil.

 

[tundraotto]

Usually its Non-Detergent SAE30 oil...sometimes referred to as 'pump oil'

 

[demarpaint]

Usually its Non-Detergent SAE30 oil...sometimes referred to as 'pump oil'

That's all I ever used. My current fill is Supertech from Walmart, under $3/quart if my memory serves me correctly.

 

[Propflux01]

Cool, thank you

 

[Tom NJ]

Non-Detergent SAE 30 oil is fine but NOT an SA. Those pistons can wear, so an SL would be ideal but SN is also good - need some anti-wear.

Mine failed from piston wear, so I blended up my own oil based on 50/50 PAO/POE with a boron based EP and strong anti-oxidants. It's been running for at least 10 years now with no problems.

 

[jeepman3071]

I've replaced a lot of pumps for customers, usually they come with a sticker saying 30 ND or just SAE 30, but the last 3 or 4 I've done have come with a tag saying 90w or 75w90, including the pump I put on my own pressure washer. I'm currently on my second season with it running Redline 75w90 since I had some left over from doing the differential in my car. Seems good so far.

 

[Propflux01]

I’ve seen a few that say 15w40. I’ve never seen a ND in that grade

 

[bigdawglanecreek]

My unit has a Comet pump and I have used their oil.

I think the manual says to use a 15w oil.