Transfer pumps and machine oils/grease

[00Buck]

For those of you who pump washes with those metal housing pumps have you ever had any issue with oils or greases that are in them? I bought a 12v Drummond pump from Harbor Freight and after I tested it on just regular water I noticed a clear grease in the outlet side. Not sure if its a packing grease to keep it from corroding or if its in the internals for lubrication, either way it was in the pump. I hooked it back up and let it run 5-10 minutes and I don't visually see anything but that doesnt mean it isn't all gone. Just curious if anyone's noticed it or had any issues with it, I really dont like the idea of any of that finding its way into my boiler.

Before anyone recommends a racking cane I make alot of wash at a time and save it for future uses and it would take way too long to use that