I'm replacing the pump on my parent's pressure washer with a new one, since the plastic water inlet broke and it's an NLA part. The new pump is from a different manufacturer(AR, instead of OEM Technologies/FNA Group), it's one of these guys: https://www.arnorthamerica.com/prod...vertical-gas-flange-aluminum/srmw22g26ez
Of course AR calls for their own oil, AR64545. The label on the pump says use SAE 90W or 85W90. The "crankcase" on these pumps holds less than 3oz of oil. It houses the swashplate mechanism that drives the pump's pistons - it works like a car's AC compressor.
From what I've googled, most people have been using gear oil and the OEM oil does smell like it. I was planning on draining the factory fill and using a synthetic 75W-90 like M1, Red Line, Amsoil or ST. Will this work? The goal is to have this pressure washer run for a good while until it's time to junk it.
Of course AR calls for their own oil, AR64545. The label on the pump says use SAE 90W or 85W90. The "crankcase" on these pumps holds less than 3oz of oil. It houses the swashplate mechanism that drives the pump's pistons - it works like a car's AC compressor.
From what I've googled, most people have been using gear oil and the OEM oil does smell like it. I was planning on draining the factory fill and using a synthetic 75W-90 like M1, Red Line, Amsoil or ST. Will this work? The goal is to have this pressure washer run for a good while until it's time to junk it.
