The ENPO STOU SAE 15w40 is a Super Tractor Oil Universal (STOU). As the name suggests, it is a universal Transmission lubricant meant for tractors and similar heavy machinery It is a mineral based transmission oil, suitable for air cooled engines of heavy duty machinery. Being a universal lubricant, this transmission fluid applies to not only diesel engines, but also hydraulic systems, transmissions and differentials with wet brake systems.




Excellent Engine Protection

Excellent Corrosion Protection

Perfect Cold Start

Minimal Friction

Excellent cold temperature fluidity.


The ENPO Super tractor oil universal is applicable to most two stroke air cooled  engines. Such as those  present in tractors and similar heavy duty machinery. Being a universal oil, it can also be applied to the hydraulic systems and transmissions of such machinery.

API performance Level

API         TC


Parameters Test Methods Unit Result
Density at 15 ASTM D4052 g/ml 0.880
Kinematic Viscosity at 40 ASTM D445 mm²/s 55.3
Kinematic Viscosity at 100 ASTM D445 mm²/s 8.3
Pour Point ASTM D6892 -15
Flash Point ASTM D92 106
Viscosity Index ASTM D2270 121
B.N (HClO4 Method) ASTM D2896 mg KOH/g 1.1
Color Visual RED

The ENPO Super tractor oil universal is applicable to most tractors, harvesters and other outdoor machinery. It works well with air cooled two stroke engines and can also be used in Transmissions, differentials and hydraulics of such vehicles.

The ENPO Super tractor oil universal, as the name suggests, is a tractor and heavy machinery oil. It is not for use with everyday cars.

STOU stands for Super tractor oil universal, whereas 15W40 is a viscosity rating that explains the lubricant’s thickness and flow characteristics at different temperatures

Verily, The ENPO Super tractor oil universal, 15w40 lubricant provides many additional benefits to tractor engines, including its  excellent protection  from rust and  wear and tear. It also keeps your engine clean and minimizes friction, thereby maximizing the life of your engine.

Weather you are using the ENPO Super tractor oil universal, or any other transmission lubricant.Make sure to always refer to your tractor’s manual while considering oil change intervals, as they not only depend on the oil used but also on the engine itself and the work load.

Although the ENPO STOU 15 w 40 transmission lubricant operates over a wide range of temperatures, it is generally not recommended to use this oil in extreme conditions. Every lubricant has its own temperature rating, make sure to use the lubricant which is capable of tolerating your temperature setting.

You can purchase the ENPO Super tractor oil universal, 15w40 lubricant, here and now at Fubex.net.

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