OIL in the has come from worn turbo, now replced but will take a while to get rid of all of it, I am sure a few more miles after lay up it will be ok.
If you have not done so a oil+filter change would be a good idea, SILKOLENE PRO S is a very suitable and good oil, from OPIE OILS on here, about £40 delivered 5 litres.
tabetha