Hiya skywalker71 mate.....i mean john
I have a pressure washer & under the engine,between engine & trolley,is a rubber gasket.....after a while the nuts come loose on mine & i have to slightly tighten them as i start to seep oil from joints:
Dont know if yours the same mate,but if it is,check it out dude......
I find with pressure washers,all that rattleling,full pelt loosens nuts here & there....dry it off & c where it's coming from fella
Good luck mate
Kind regards
Justin