Crude futures edged lower on Tuesday amid perceptions that the dollar remains on a long-term strengthening trend due to expectations for U.S. monetary policy to tighten while Europe and Japan move in the opposite direction. A stronger greenback makes oil a less attractive commodity on dollar-denominated exchanges, especially in the eyes of investors holding other currencies. Supply concerns in Libya allowed the commodity to move into positive territory at times. In the New York Mercantile Exchange, West Texas Intermediate crude oil futures for delivery in December traded up 0.06% at $77.45 a barrel during U.S. trading, up from a session low of $76.45 a barrel and off a high of $77.65 a barrel. The December contract settled down 1.59% at $77.40 a barrel on Thursday. Support for the commodity was seen at $75.84 a barrel, last Tuesday’s low, and resistance at $79.85 a barrel, Monday’s high. Oil prices fell earlier on expectations that the Federal Reserve remains on track to begin hiking interest rates in 2015, which have supported the U.S. dollar. The Department of Labor reported on Friday that the U.S. economy added 214,000 jobs in October, missing expectations for an increase of 231,000, though a longer-term analysis of the labor market still points to recovery. Separately, concerns that conflict in Libya may disrupt the country’s El Sharara oilfield cushioned losses and sent futures into positive territory at times. Protests and blockades have reportedly begun to affect operations in the conflict-weary country. Elsewhere, prices remained under pressure on expectations for Iran to strike a nuclear deal with the West that would lift sanctions and allow more supply on the global market. Separately, on the ICE Futures Exchange in London, Brent oil futures for December delivery were down 0.91% at US$82.20 a barrel, while the spread between Brent and U.S. crude contracts stood at $4.75.