L.E. Plus Engine Oil

SAE 15W40

No. 421


  • Diesel Engines
  • Gasoline Engines

L.E. Plus Engine Oil is a premium blend of synthetic fluids and hydro-treated base oils formulated specifically to optimize performance in all diesel engines running on Ultra Low Sulfur Diesel Fuel.

L.E. Plus is fully compliant with all 2007 engines with diesel oxidation catalysts and particulate filters requiring a CJ-4 specification. This exclusive formulation exceeds API CJ-4, SM, ACEA E7-4 (2004) performance requirements as well as all major engine manufacturers’ specifications. It is designed to provide unsurpassed control of soot and provide the highest degree of protection in the industry against wear of piston rings and cylinder liners. L.E. Plus also provides unequaled protection of highly stressed valve train systems used in modern diesel engines. L.E. Plus Engine Oil is compounded with Frontier’s exclusive ETX extender additive package that neutralizes acids in the early stages of use without sacrificing long term TBN values. This enables it to be used as an extended drain interval oil.


Engine designs are changing to meet emission requirements. Many engine manufactures are using EGR (exhaust gas recirculation) to reduce particulate emissions. The use of EGR systems can increase the soot loading in a lubricant leading to higher wear, oil thickening and filter plugging. The engines being developed today have higher operating temperatures, and are more susceptible to deposits. L.E. Plus has been developed specifically for these engines with a higher thermal stability and the recommended maximum detergency to reduce varnish and gum deposits and to greatly reduce oil oxidation and oil consumption. These benefits not only protect low-emissions diesels from wear and deposits, they also provide maximum protection in pre 2007 engines running on ultra low sulfur fuel as well. Extensive field tests show superior deposit control to any other oil on the market. The reason for better performance is increased levels of reserve alkalinity. Detergent/Dispersant alkalinity has been directly correlated with reduced ring wear, improved piston cleanliness, reduced bearing wear, improved oil consumption, extended service intervals and better fuel economy.


L.E. Plus Engine Oil provides the following advantages:

  • Meets or exceeds the performance requirements of current and proposed engine oil specifications
  • Protects low emission diesel engines from wear and deposits
  • Provides excellent wear and deposit protection in pre 2007 engines running on ULSD fuel
  • Resists soot related viscosity increase, filter plugging and wear
  • Extends engine life while meeting emissions requirements


                    API: CD, CDII, CE, CF/CF-2, CG-4, CH-4, PC-6, CI, CI-4 Plus, CJ-4

                    API: SH, SJ, SM

        ACEA:  E7-4 (2004)

                    CAT ECF-3                                                               MB-APROVAL 228.3

                    CUMMINS CES 20081                                           MB-APROVAL 228.31

                    DETROIT DIESEL DDC 93K218                         MTU TYPE 2

                    MACK EO-O PREMIUM PLUS                              VOLVO VDS-4



                    COLOR                                                                                            Amber

                    TBN                                                                                                     10

                    SAE GRADE                                                                                  15w/40                                                     


                                            Viscosity @ 40°C (104°F)                                                     100.1                                

                                            Viscosity @ 100°C (212°F)                                                     14.62                                  

                                            Viscosity Index (ASTM D2270)                                           >150           

                                            Pour Point °F                                                                           – 30          

                                            Flash Point COC °F                                                               430


                                  Four Ball Wear (ASTM D-4172) 40 kg., 1200 RPM, 1 hr.         0.35 mm

Values shown are typical, and due to manufacturing tolerances may vary.