I use 30wt Castrol in mine-the unit is 8 years old with
original pump. Gets lots of use. The oil should be changed
in the pump after every hour of use, if you want it to last.
JR

VITO wrote:

what variety of oil should i select for the pressure
washer pump. I haven't changed it yet this year. We have
a Karcher 3500 hd. i'm sure it's detergent free

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