WASHINGTON — Manufacturer Shell Rotella rolled out its new lineup of lubricating oils designed to maintain the hotter-burning diesel engines coming in January 2017 and beyond.

NASHVILLE, Tenn. — Work on improving engine oils to assist in fuel efficiency is complete, and the two new oils, CK-4 and FA-4, will be available in December, said Dan Arcy, global OEM technical manager of Shell Global Solutions.

Royal Dutch Shell Plc and the United Steelworkers, which represents 30,000 U.S. oil workers, are said to be planning to restart talks this week to resolve a labor dispute as more workers joined in the nation’s biggest refinery strike since 1980.