If the sludge trap isn't / wasn't full, I wouldn't worry but run it and see how it goes. If the sludge trap is / was full, I would worry but run it and see how it goes.
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.