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Chevron: Zinc levels in US Mars oil production within limits

Chevron, the oil producer, said that recent tests showed that zinc levels in Mars' flagship U.S. off-shore crude are within acceptable levels.

This month, the start-up a well offshore increased the zinc levels in Mars crude. The tightening of crude supplies at the Gulf Coast's key refining hub led the U.S. Government to release barrels of its emergency stockpile.

Chevron stated in an email that it was not aware of any compositional problems with the Mars crude blend.

Chevron announced that it is working with Shell, the operator of pipelines to develop a program for monitoring zinc levels in all pipelines.

The crude grade price rose 10 cents on Tuesday to trade at $1.30 less than it was on Monday, when it had reached its lowest level in nine months.

Exxon Mobil, the world's largest oil company, briefly stopped buying Mars crude at the beginning of July because of contamination. Sources say that the company resumed its purchases for August delivery last week.

The company also used the U.S. Strategic Petroleum Reserve to obtain up to one million barrels for its Baton Rouge Refinery in Louisiana.

Mars, a medium-sour crude oil produced off the coasts of Louisiana, has been chosen by refineries on the Gulf Coast due to its properties and close proximity.

Refineries typically run a certain grade of oil to get the best yields for different types of fuels. Switching crude grades can limit production and shrink profit margins.

Zinc is not a natural component of crude oil. Industry sources are concerned that running crude oil with zinc may damage refining units or catalysts. Reporting by Arathy S. Somasekhar, Houston; editing by Ni. Williams

(source: Reuters)