US STOCKS-Wall St lower as Brent retreats, Apple drags
* Exxon, Chevron slide as crude gives up gains
* Pep Boys down after Bridgestone pulls out of buyout
* S&P 500 marginally positive for year
* Indexes down: Dow 0.18 pct, S&P 0.25 pct, Nasdaq 0.32 pct (Adds details, updates prices)
By Abhiram Nandakumar
Dec 30 (Reuters) - Wall Street was lower on Wednesday as Brent crude slid back towards the 11-year low it hit last week and Apple weighed on all three major indexes.
Crude oil gave up its gains from Tuesday after forecasts of a short winter in North America and Europe piled pressure on the oversupplied commodity.
The S&P 500 energy sector led nine of the 10 major S&P sectors lower with a 1.14 percent decline. Shares of Exxon were down 0.8 percent at $78.56, while Chevron was down 1.2 percent at $90.11.
The energy sector has fallen 23.54 percent for the year, easily the worst performer on the index, followed by a 9.17 percent decline in materials, caused by a rout in commodities. Continuación...