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TRUEGARD 15W40 Motor Oil - 5 Gallon Pail

TRUEGARD 15W40 Motor Oil - 5 Gallon Pail

by Truegard
SKU 100112
$114.80 - $114.80
$114.80
$114.80 - $114.80
$114.80

TRUEGARD SEMI SYNTHETIC 15W/40 combines premium base stocks with next-generation additive technology to produce our most fuel efficient cleanest burning, low-ash heavy duty engine oil to date¹. It meets or exceeds nearly all the next generation OEM specifications including those from Ford, Cummins, Detroit Diesel, Mack, Volvo, Renault, Mercedes, MAN and Deutz.


TRUEGARD SEMI SYNTHETIC 15W/40 motor oils protect engines with Emission Controls, EGR engines, as well as older engines. It is even recommended by leading heavy equipment manufacturers such as John Deere, Kubota, Massey Ferguson, JJ Case, Allis Chalmers, and International Harvester. This ground breaking low-ash technology provides improved wear protection, deposit and soot control, and improves oil consumption by neutralizing combustion by-products that cause harmful deposits¹.


TRUEGARD SEMI SYNTHETIC 15W/40 is an extended drain capable engine oil that prevents viscosity loss from shearing and reduces friction leading to longer engine life and improved fuel economy¹. Its high film strength makes TRUEGARD SEMI SYNTHETIC 15W/40 fluids suitable for both on and off-road driving conditions. It can be recommended for new engines requiring CK-4 fluid and is backward
compatible with API CK-4, CJ-4, CI-4 PLUS, CI-4, and CH oils.

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Product Data Sheet
Safety Data Sheet

Frequently asked questions

Find answers to common questions about our products and services

  • This oil is designed for a wide range of heavy-duty diesel applications, including on-highway engines from Cummins, Detroit Diesel, Mack, Volvo, Renault, Mercedes, MAN, Deutz, and Ford, as well as off-road and agricultural equipment from John Deere, Kubota, Massey Ferguson, Case, Allis Chalmers, and International Harvester. It is suitable for both newer engines with emission controls and EGR systems, as well as older legacy engines.

  • This oil meets the current API CK-4 standard and is backward compatible with API CJ-4, CI-4 PLUS, CI-4, and CH. This means it can be used in older diesel engines previously requiring any of those earlier specifications, making it a single consolidation option across a mixed fleet.

  • Engines equipped with EGR systems and aftertreatment devices such as diesel particulate filters are sensitive to ash deposits generated by oil additives. TRUEGARD's low-ash technology reduces deposit and soot build-up on these components, helping preserve their function and protecting against premature wear and costly repairs.

  • Yes, TRUEGARD Semi Synthetic 15W-40 is described as extended drain capable. Its formulation resists viscosity loss caused by shearing, meaning the oil retains its protective film strength and lubricating properties over longer service intervals compared to conventional heavy-duty oils.

  • Semi-synthetic means the oil blends premium conventional mineral base stocks with synthetic base stocks, offering improved wear protection, better deposit and soot control, and greater fuel efficiency compared to straight conventional oil. The product data notes it uses next-generation additive technology to achieve these gains at a lower cost point than a full synthetic.

  • Because TRUEGARD 15W-40 is backward compatible across multiple API service categories (CK-4 through CH), it is generally suitable for top-up use in engines already running an oil of equivalent or lower specification. However, mixing oils from different formulations is not ideal for maintaining the full performance benefits of either product; a complete oil change is recommended when switching.