Need some washers to seal the top of my contraption.
Are these safe? Advertised for use with oil.
http://www.ebay.com.au/itm/10-x-Black-Silicone-O-Rings-Oil-Seal-Gaskets-Washers-20mm-x-2-65mm-/390496238712?pt=LH_DefaultDomain_3&hash=item5aeb63bc78&_uhb=1#ht_1545wt_919