Methacryloyl chloride was reacted with 4-amino and 4-thiophenols to provide the corresponding methacrylamides. These compounds were incorporated in NBR mixes to be evaluated as antioxidants for NBR oil-seal products in comparison with the industrial antioxidant phenyl-B-naphthylamine (PBN). The mechanical, swelling, percentage volume extraction, and compression recovery properties of the produced rubber vulcanizates were assessed. It has been found that the prepared antioxidantN-(4-hydroxyphenyl)methacrylamide (4-HPM) is superior for swelling and compression recovery of oil-sealing products.