http://articles.mercola.com/sites/articles/archive/2005/10/15/can-changing-the-oil-elevate-your-ra-risk.aspxResearchers from Sweden 's Karolinska Institute have found that exposure to mineral oils, especially hydraulic or motor oil, is linked to a 30 percent increased risk of rheumatoid arthritis (RA). It is thought the oils may contain molecules that activateenCommunityServer 2008.5 SP1 (Build: 31106.3070)