These might be ok, I contacted a company in Derbyshire who have started making hoses. There on ebay (seller id dphsport), the hoses are 4.5mm and look good, I messaged him to see if they would be ok to run from my turbo (oil drain), see below for his reply.....
Hi Dean, over time oil degrades the silicone, you should use a fluro silicone hose that has a liner in to protect the silicone. I'm afraid that i don't have any fluro material in at the moment.