Shell: New Engine Oil Categories Making the Grade
Since 2011 the company has amassed 60 million test miles on CK-4 formulations, and 50 million miles of tests involving the High Temperature High Shear (HTHS) formulas required by FA-4 specifications. Photo: Shell
">Since 2011 the company has amassed 60 million test miles on CK-4 formulations, and 50 million miles of tests involving the High Temperature High Shear (HTHS) formulas required by FA-4 specifications. Photo: Shell
">SANTA BARBARA, CA – A new generation of engine oils is in the North American market, passing a battery of tests developed for specific engine brands. But the work of convincing buyers about related features and benefits continues.
The transition from CJ-4 to CK-4 and fuel-efficient FA-4 categories has essentially been seamless, said Dan Arcy, Shell Lubricants' global OEM technical manager, during a media briefing in California this week. The new formulas, which went by PC-11 during the development process, were officially released in December. The chemistry was driven by ongoing calls for longer drain intervals, better fuel economy, lower emissions, and increasing horsepower.
And these are hardly the engine oils that have flowed through pumps in years gone by.
Oxidation stability had to improve to handle higher under-hood temperatures. When oil oxidizes, it becomes acidic and thickens, Arcy explained. At the very least, that shortens potential oil drain intervals.
Tighter controls on aeration are especially welcome in off-highway applications, where trucks traveling up and down hills tend to suck air into the oil pump, breaking up the all-important layers of lubricant. Shear stability, meanwhile, had to improve to help keep oils from shearing out of grade into lower viscosities.
At this point, he said, manufacturers are all recommending CK-4 engine oils, and many have also increased maximum drain intervals in conjunctino with the new oil, Arcy said. “There's some caveats" when extending those drains, he noted. "There's fuel economy requirements. There's idle requirements.”
Cummins has increased standard drain intervals up to 50,000 miles with CK-4 or FA-4 formulas compared to the 40,000 miles with the CJ-4 that came before them, and will boost ...Read the rest of this story
