ExxonMobil has unveiled its lineup of Mobil Delvac™ diesel engine oils that are designed to meet or exceed the new API CK-4 and FA-4 service categories, which will officially be available for licensing in December 2016. While these categories were being developed, they were referred to as PC-11A and PC-11B.

The new lineup includes improved versions of current Mobil Delvac products, including Mobil Delvac 1ESP, Mobil Delvac Elite and Mobil Delvac 1300 Super. The new CK-4 products include Mobil Delvac Extreme, available in SAE 10W-30 and 15W-40 viscosity grades, and Mobil Delvac 1300 Super, in these same two grades. The new FA-4 products include Mobil Delvac Extreme FE in SAE 10W-30 viscosity grade and Mobil Delvac Super FE in SAE 10W-30 viscosity grade. Mobil has not released the name of its new advanced fully synthetic FA-4 oil.

FA-4 oils will not have the same backwards compatibility of CK-4 oils.

ExxonMobil said it has accumulated more than 30 million miles of testing data on its new CK-4 and FA-4 formulations as of August 2016.

Test results showed that the new PC-11 oils provided 20% improved wear protection, 50% improved oxidation resistance and 80% improved high-temperature viscosity control, when compared to CJ-4 Mobil Delvac 1300 Super and Mobil Delvac Elite engine oils.

In addition, PC-11 oils showed enhanced fuel economy potential (for FA-4 products only) and protection beyond original equipment manufacturer (OEM) oil drain intervals.

“As these results indicate, fleets that have been testing our CK-4 and FA-4 formulations have consistently reported exceptional results,” said Michael Smith, commercial vehicle lubricants global brand manager, ExxonMobil Fuels and Lubricants.

Current field testing includes about 200 trucks. The company said it continues to accumulate more than 1.5 million miles per month of additional testing data.