* Hit over $80 on weaker dollar
* U.S. crude inventories expected to rise
* OPEC Secretary-General says prices at $80 "a bit high"
(Updates prices, adds U.S. stocks, refiles to fix instrument code for Apple)
By Emma Farge
LONDON, Oct 20 (Reuters) - Oil slid below the $80 a barrel mark on Tuesday, after earlier passing it with support from a weaker dollar, but a cautious reassessment of supply and demand and weaker U.S. stocks tempered the rally.
The dollar hit a 14-month low against a basket of currencies on Tuesday. [
] A weak dollar makes dollar-denominated commodities such as oil cheaper for holders of other currencies.U.S. crude for November delivery <CLc1> touched $80.05 a barrel in Asian trade, its highest since Oct. 14 last year, but then retreated to $79.32 barrel by 1354 GMT, down 29 cents. The contract expires on Tuesday and the new December contract also fell 29 cents to $79.67 by the same time.
London Brent crude <LCOc1> fell 12 cents to $77.65 a barrel.
Oil prices have surged by nearly $10 since the start of October, fuelled by strong quarterly results from bellwethers Apple <AAPL.O> and Caterpillar <CAT.N> and general optimism about the corporate earnings season as a sign of economic recovery and renewed oil demand growth.
But U.S. stocks fell shortly after the open on Tuesday and this accelerated intraday losses on oil. [
]"We see little support for the rally, which is now eight days old, and think that at some point OPEC spare capacity of about 6 million barrels and massive on and offshore stocks will trigger a correction phase," said JBC Energy analyst David Wech in a research note.
OPEC Secretary-General Abdullah al-Badri said on Tuesday that oil prices at $80 a barrel were "a bit high", but they had helped the group revive major upstream investment projects to create a larger supply cushion. [
] [ ]"There was not any strong fundamental factor for the move from $75 to $80. Now the market is looking for a fundamental story and OPEC is starting to make some noise," said analyst Olivier Jakob of Petromatrix.
U.S. stocks data from the American Petroleum Institute due later on Tuesday could lead to further losses if crude inventories rise, analysts said.
A preliminary Reuters poll of analysts forecast the data will show a 2 million barrel build in crude stocks last week. [
]U.S. distillate stocks, which include heating oil, are near 26-year highs and are expected to be ample even if forecasts for below-normal temperatures materialise in the United States this winter. [
]Analysts said that if prices once again surpass $80 a barrel the rally could gather fresh momentum because of a high density of call options -- a contract that gives traders the option of buying crude at a set price -- at around this level.
"Above $80 a barrel it's a question of options. There are layers of calls at this level," said Jakob.
For a graphic showing options see below.
http://graphics.thomsonreuters.com/109/CMD_OLOPT1009.gif