BUENOS AIRES, Oct 30 (Reuters) - U.S. energy giant Exxon

Mobil ( XOM ) agreed on the terms and conditions to sell its oil

and gas assets in Argentina's Vaca Muerta formation to

Pluspetrol, a source at Exxon Mobil ( XOM ) said on Wednesday.

Exxon will sell five blocks in Argentina's western Neuquen

province, home to Vaca Muerta, and its stake in Argentine oil

pipeline operator Oleoductos del Valle (Oldelval), the source

said.

The source declined to provide details on how much the

deal is worth or when it would be finalized.

"We continue to work together with the buyer and the

Neuquen government to achieve alignment on the desired results,"

the spokesperson added.