(800) 537-7683 SDS Contact Us Register / Sign in Applications Lubricants Reliability Solutions Industries Training About LE Premium Engine Oils for Diesel and Gasoline Engines Home » Lubricants » Engine Oils LE is your go-to destination for high performance engine oils The technology exists to build high-performance engine oils that can withstand conditions and rigors for diesel trucks, passenger cars, light duty trucks and stationary engines. Typically, engine oils are made up of 70 to 90 percent base oil and 10 to 30 percent additives. Lubrication Engineers uses premium quality base oil and best-in-class additive technology to formulate engine oils that maintain their viscosity, keep engine wear to a minimum, and help ensure dependability. LE engine oils are formulated to meet the needs of our industrial customers and in most cases easily exceed the Automotive Performance Institute (API) specifications for performance. We have customers all over the world that use our engine oils and swear by their performance and ability to keep engines protected from wear and running at peak performance. Extended Drain CK-4 Diesel Engine Oil Monolec Ultra® Engine Oil (8800-8801 & 8130-8131) If you’re looking to get the most out of your fleet’s performance, LE’s Monolec Ultra Engine Oil is CK-4-rated, heavy-duty oil that provides exceptional all-season performance for diesel engines. Used by small and large fleets all over the world, it contains shear-resistant viscosity index improvers that provide good viscosity properties at both high and low temperatures and are designed for extended drain intervals. Available in 10W-30 and 15W-40 SAE grades, it increases engine life and provides improved fuel efficiency, rust protection and wear reduction. Extended drain service can be achieved with periodic filter changes and when using LE’s Xamine Oil Analysis Program. Monolec Ultra Engine Oil exceeds Mack, Cummins, John Deere, Allis-Chalmers, Detroit Diesel, Ford, GM, Chrysler, Caterpillar and other manufacturers’ requirements; and it is backward compatible for use in older diesel engines. Typical Applications: On- and off-road diesel engines, including over-the-road tractor trailers, pickup trucks, construction and mining equipment, farming equipment, and more; stationary diesel engines, such as generators and irrigation pumps. Available SAE Grades: 15W-40 (8800/8801), 10W-30 (8130/8131) Monolec® Engine Oil (8700-8730) If you are not looking to extend drains but still want premium quality CK-4 diesel engine oil, Monolec Engine Oil provides wear protection and excellent service for engines in mobile equipment and stationary generators. With its formulation of select base oils, shear-stable viscosity improver and Monolec, LE’s exclusive wear-reducing additive, Monolec Engine Oil offers increased fuel efficiency, dependable performance and wear protection. It is available in 15W-40 and 10W-30 SAE grades and is especially formulated for low-emission and ultra low sulfur diesel (ULSD) engines and backward compatible for use in older diesel engines. Typical Applications: Diesel engines (fleet), including over-the-road tractor trailers, pickup trucks, construction equipment, and farming equipment; diesel engines (industrial), including stationary generators Available SAE Grades: 15W-40 (8700), 10W-30 (8730) Monolec Ultra® Syn Heavy Duty Engine Oil (8854-8855) Monolec Ultra Syn Heavy Duty Engine Oil pays for itself with all-weather performance, wear protection and fuel economy. This broad-range multiviscosity synthetic oil for diesel engines delivers outstanding year-round performance, wear protection, fuel efficiency and extended drains. With its synthetic base oil and exclusive additive package, this 5W-40 formulation reliably lubricates diesel engines, even in low-temperature conditions, without the shear stability and viscosity problems of conventional diesel engine oils. Its high viscosity index indicates less change in viscosity over a broad operating temperature range. One of the primary advantages of 5W-40 vs. 15W-40 engine oil is better fuel economy. In a controlled lab setting, GM 6.5L dyno testing showed a 1.5-1.6 percent fuel economy improvement. In addition, broad-range oils are preferred for low-temperature conditions because of their ability to achieve flow quickly during cold startups. Most engine wear occurs within the first two to five minutes of starting. However, conventional low-viscosity oils have not always provided adequate oil film at operating temperatures. This resulted in increased wear and made it difficult to obtain OEM approvals. The improved technology of Monolec Ultra Syn has eliminated this problem, enabling it to achieve flow quickly in cold weather and maintain viscosity. It also meets all major OEM approvals. Monolec Ultra Syn Heavy Duty Engine Oil lubricates important parts faster, prevents wear during operation, and decreases fuel consumption – making it the smart choice for on- and off-road fleet managers and owner operators who want better fuel economy, reliable low-temperature performance, or a combination of both. Typical Applications:Diesel engines in Class 8 tractor trailer trucks, construction vehicles and other off-road mobile equipment Available SAE Grade: 5W-40 (8854/8855) Straight Grade Diesel Engine Oil Monolec® GFS Engine Oil (8430-8450) Monolec GFS Engine Oil is a a straight-grade engine oil formulated for extended drain service, primarily in off-road diesel engines. It contains Monolec, LE’s exclusive wear-reducing additive, and is specified mostly for engines but is also sometimes used in industrial applications. Typical Applications: Off-road diesel engines, air compressors Available SAE Grades: 30 (8430), 40 (8440), 50 (8450) Synthetic Gasoline Engine Oil Monolec® Syn Engine Oil (8511-8531) To provide the best protection for your car’s engine without sacrificing performance, endurance and efficiency, look no further than LE’s Monolec Syn Engine Oil. This high-quality, high-performance, proprietary synthetic engine oil for gasoline engines is available in 0W-20, 5W-20 and 5W-30 SAE grades. It exceeds the minimum standards set by API, providing the ultimate combination of performance, protection, endurance and efficiency. The secret to its superiority is the proprietary additive package designed to deliver resource-conserving fuel economy, protect emissions systems, keep engines clean and keep deposits to a minimum. Whether you are a car enthusiast or the manager of a fleet of gasoline engines, you’ll appreciate this passenger car motor oil’s ability to keep your engines running for longer periods while safely extending the time between oil changes. Typical Applications: Personal passenger cars and passenger car fleets (municipal, delivery, etc.); offers exceptional performance suitable for use in most OEM gasoline engines, including Honda, Ford, GM, Toyota, Chrysler, Nissan and Hyundai/Kia. Available SAE Grades: 0W-20 (8511), 5W-20 (8521), 5W-30 (8531) Two-Cycle Gasoline Engine Oil Monolec® Two-Cycle Engine Oil (8104) Monolec Two-Cycle Engine Oil is a heavy-duty oil specifically formulated to provide outstanding lubrication for all two-cycle engines, allowing them to run smoother, cooler and more efficiently. It contains premium base oil for greater film strength, better lubricity and higher natural viscosity index than competitive products, and contains LE’s exclusive Monolec additive for superior wear protection. This special formulation mixes easily with all types of gasoline and ensures optimal engine performance. In two-cycle engines, lubrication is achieved by mixing the lubricant with the fuel, and using the fuel coming into the carburetor as a carrier for the oil. Lubrication of the entire engine must be accomplished in a single pass through the system. The fuel/oil/air mixture passes from the carburetor into the combustion chamber in a split second, where high temperatures instantly vaporize the gasoline. The oil, in droplet form, must lubricate all moving parts of the crankshaft, plus the piston and cylinder. If combustion of the oil is incomplete, or byproducts are deposited in the cylinder, serious problems can develop. Typical Applications: Chainsaws, motorcycles, outboard motors (under 50 hp), portable generators, pumps, snowmobiles (air-cooled engines), and any other two-cycle gasoline engines Available SAE Grades: 40 (8104) – can also be used for SAE 30 applications Dry Fuel Natural Gas Engine Oil LE’s dry fuel engine oils include multigrade low-ash, straight-grade low-ash, and straight-grade medium-ash natural gas engine oils. Proven performers in various engine makes and models, under severe operating conditions, LE’s dry fuel engine oils decrease friction, minimize wear, remove heat and keep engines clean. Monolec® Natural Gas Engine Oil (8845) Monolec Natural Gas Engine Oil is multigrade low-ash oil that provides long-lasting, all-weather protection for natural gas engines. It is formulated for use in stationary and mobile natural gas engines and is made from a synergistic blend of high-performance base fluids, salicylate detergent chemistry and superior wear-reducing additives. The resulting low-ash, engine-cleaning blend provides the perfect long-lasting wear protection without the accumulation of heavy deposits. Monolec Natural Gas Engine Oil is a proven multigrade performer in various engine makes and models, even under severe operating conditions. Typical Applications: Stationary gas engines used for power generation or natural gas pumping operations; sparkplug-ignited engines, including mobile applications such as buses with converted Cummins and Detroit diesel engines Available SAE Grade: 15W-40 (8845) Monolec® Natural Gas Engine Oil (8945) Monolec Natural Gas Engine Oil is straight-grade low-ash oil formulated with cutting edge technology that differentiates its performance from other natural gas engine lubricants. It is formulated using high-performance base fluids, salicylate additive chemistry for superior deposit control, and outstanding anti-wear additives, including Monolec, LE’s exclusive wear-reducing compound. All of these components work together synergistically to greatly decrease friction, minimize wear, remove heat, and keep engine components clean. This oil has been proven in various engine types, under severe operating conditions. Typical Applications: Stationary gas engines used for power generation or natural gas pumping operations Available SAE Grade: 40 (8945) Railroad Diesel Engine Oil Ultra Railroad Diesel Engine Oil (8900) For heavy-duty, long-drain service in modern high-efficiency railroad diesel engines, LE’s Ultra RDE Oil was designed to protect silver alloy bearings from wear and contamination. In addition to increasing the engine lifespan, Ultra RDE Oil improves fuel efficiency, reduces wear and provides a high degree of engine protection. It is formulated with highly refined select base oils and exceeds the standards of EMD railroad engines, GE railroad diesel engines, Bombardier railroad diesel engine, Caterpillar diesel engines, Generation IV and API CD. Typical Applications: Railroad diesel engines Available SAE Grade: 40 (8900) For more information about any of LE’s engine oils, please contact us today. Need a product recommendation? 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