These letters are based on a group of laboratory and engine tests that determine the oil’s ability to protect the engine from wear and high-temperature deposits and sludge. API has a full list ...

Up to 10% increased fuel economy over other gas engines. Oil-drain intervals of 15,000 miles. Fuel-tank options of 45 to 80 gallons. Cummins says the engine has undergone 2 million miles of testing.

New York hedge fund Elliott Management is pushing British oil major BP (BP) to abandon all renewable energy projects, it was reported, after a corporate strategy reset fell short of the mark.

Donald Trump has ended oil giant Chevron’s (CVX) permit to operate in Venezuela, a move that could shake the country’s fragile economy. The move follows Trump’s February 19 warning that ...

In the past, there have been similar shifts in preferred engine oil viscosity grades. An example is the transition in heavy duty diesel engine oils in the 1980s from monograde viscosity SAE 30 and ...

“The old belief that if you start an engine on one brand/type of oil that you should stay with that oil is really part of a long-standing myth,” says Mark Betner, manager of heavy-duty engine ...