* Dollar up, weighing on oil as euro weighed by Greece * Coming up: Oil market eyes OPEC, Fed meetings this week NEW YORK, March 15 (Reuters) - U.S. crude oil futures fell on Monday as the dollar strengthened and amid follow-through weakness after the previous session's close to the downside. Oil markets also eyed this week's U.S. Federal Reserve meeting to see if it remains committed to low interest rates and the OPEC ministers' meeting in Vienna where they will consider output and market share policy. "Oil in New York is trading below $81 a barrel as the dollar index gained for the first time in four days. European stocks are slightly lower as investors are cautious ahead of the (Fed) meeting this week," Addison Armstrong, analyst at Tradition Energy in Stamford, Connecticut, said in a research note. The euro slid against the U.S. dollar, hampered by a lack of progress on a financial aid package for debt-strapped Greece. [USD/] The dollar was up against a basket of currencies. .DXY U.S. stocks fell at the open, weighed by persistent concerns over a possible monetary tightening in China that could slow the global recovery from recession. [.N] Those worries about the potential for China tightening monetary policy also weighed on copper. [ID:nLDE62E0V7] OPEC ministers have indicated that there is no need to change output targets at Wednesday's meeting in Vienna with prices in the $70 to $80 range, but soft demand is prompting calls to improve compliance. [ID:nLDE62E0LM] "For the March program, we saw over 80 cargoes scheduled to be booked out of the Arabian Gulf, the most for single month since last August," Dahlman Rose & Co said in its Marine Transport Weekly report on Monday, another indication of a market attracting supply. PRICES * On the New York Mercantile Exchange at 10:15 a.m. EDT (1415 GMT), April CLJ0 crude was down $1.57, or 1.93 percent, at $79.67 a barrel, trading from $79.54 to $81.31. * In London, April Brent crude LCOJ0 fell $1.56, or 1.96 percent, to $77.83 a barrel, trading from $77.71 to $79.53. * NYMEX April RBOB RBJ0 fell 3.74 cents, or 1.66 percent, to $2.2176 a gallon, trading from $2.2155 to $2.2622. * NYMEX April heating oil HOJ0 fell 3.40 cents, or 1.62 percent, to $2.06 a gallon, trading from $2.0566 to $2.1065. * The April/April heating oil crack spread <0#CL-HO=R> was at $6.84. It ended Friday at $6.71. The April/April RBOB crack spread <0#RB-CL=R> was at $13.49. It ended Friday at $13.47. * The spread between the current front month and the five-year forward crude contract CLc61 was at $9.03, based on the April 2015 contract Friday settlement at $88.70. The spread ended Friday at $7.46. TECHNICALS NYMEX crude 10-day/20-day moving average: $81.17/$80.02 Technical support/resistance: NYMEX crude: $80.16/$83.16 NYMEX heating oil: $2.0647/$2.1233 NYMEX RBOB: $2.2183/$2.2917 For a full report on technicals, click on [ID:nLDE62E0ZM] MARKET NEWS * The New York Federal Reserve's "Empire State" general business conditions index dropped to 22.86 in March from 24.91 in February, falling less than forecast as employment in the sector rose to its highest since October 2007. [ID:nNYS007845] * OPEC is likely to leave oil output unchanged at its Wednesday meeting in Vienna because current prices are linked more to speculation than to supply and demand, Libya's top energy official said. [ID:nLDE62E137] [ID:nLDE62A12D]

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