Pressure Washer Pump Oil

[MrPitts]

I have a Cat Pump on my Ridgid Pressure Washer. It requires a specially formulated hydraulic oil ISO 68. I have some compressor oil ISO 68, is this the same thing or does it need to say Hydraulic oil?
Thanks,
Pat

 

[demarpaint]

I've used in mine, SAE 30 non detergent oil for well over 30 years. A light commercial application pressure washer with an 11HP Honda engine bolted to a Cat pump. The seals are just starting to go. I'd say it did well. You might want to look into it further and see if it is something worth considering.

 

[Donald]

Does the manual say to change it? I would get the proper hydraulic oil if it was mine.

 

[hatt]

Originally Posted by demarpaint
I've used in mine, SAE 30 non detergent oil for well over 30 years. A light commercial application pressure washer with an 11HP Honda engine bolted to a Cat pump. The seals are just starting to go. I'd say it did well. You might want to look into it further and see if it is something worth considering.

Yep. SAE 30 ND will keep a pump happy.

 

[bubbatime]

Just buy the Cat brand pump oil. Its good stuff. And has ingredients in it that your other ISO 68 oil does not have.

If I remember correctly, the ISO 68 oil is about a 20 weight oil, so the 30 weight pump oil that most folks use is a little thicker than what the factory uses.

https://www.homedepot.com/p/CAT-Pumps-21-oz-Pressure-Washer-Pump-Oil-AP31045/202021265

 

[LotI]

I've been running Amsoil air compressor oil ISO100 in mine, same as my air compressor. They also have an ISO68.

 

[racin4ds]

I just buy the CAT pump oil for mine, its relatively cheap and you know its the right stuff for the pump warranty. I also have a Rigid 3200psi PW and change my oil annually.

 

[demarpaint]

Originally Posted by hatt
Originally Posted by demarpaint
I've used in mine, SAE 30 non detergent oil for well over 30 years. A light commercial application pressure washer with an 11HP Honda engine bolted to a Cat pump. The seals are just starting to go. I'd say it did well. You might want to look into it further and see if it is something worth considering.

Yep. SAE 30 ND will keep a pump happy.

Yes. Mine just started complaining after 3+ decades. I think it did well.