Synthetic oils are engineered to withstand extreme conditions both hot and cold. Lower viscosity will flow better and is definitely a must in cold climates but a quality synthetic will offer as good as protection as conventional 15w-40 in warmer climates too. Many synthetic diesel oil options have a viscosity of 5w-40 and are chosen over the OEM recommended 15w-40 all the time. You may choose a different path than Ford’s recommendations based on modern oil options. This lower cold viscosity will help the engine properly lubricate on startup when cold but once operating temperature is reached the oil reaches is operating viscosity. Also, depending on how cold, a lower rated W viscosity is also recommended. All OEM oil viscosity recommendations are for an operating viscosity of 40 for warm ambient temperatures and 30 for cold ambient temperatures. To understand your oils viscosity you will notice that SAE standard rating has two numbers in the format: “#W – #” The first number is followed by a “W” which stands for Winter or the viscosity of the oil when a cold temperature and then a second number is the operating or hot viscosity of the oil.
Modern oil options are multi viscosity and contain thickening agents meaning the oil viscosity changes with temperature. Modern engine designs have very tight tolerances that require low viscosity oil such as 0 and 5 weight while many older engines designs have looser tolerances that need a “thicker” oil. The correct viscosity for an engine is dependent on the engines design tolerances as well as ambient temperatures covered above. Generally a low viscosity oil can reach vital engine parts quicker and circulates faster through the oil system, while a higher viscosity oil tends to adhere more to engine parts to provide better lubrication. An oil with lower viscosity flows faster than higher viscosity oil. Viscosity is the measure of an oils resistance to flow, some may refer to it as the thickness of the oil.
#Driven oil viscosity chart full#
Motorcraft also has a Full Synthetic 5w-40 Diesel Motor oil for colder climates that meets Ford’s WSS-M2C171-F1, API Service CK-4, and also meets older API Categories: CD, CF-4, CG-4, CH-4, CI-4, CI-4 plus and CJ-4. It meets the requirements of Ford’s WSS-M2C171-F1, Cummins CES 20086, Detroit Diesel 93K222, Volvo VDS-4.5, Mack EOS-4.5 and API Service CK-4. Motorcraft Super Duty Diesel Oil is a high quality motor oil available in 15w-40 and 10w-40 viscosity and designed for use in all Ford Power Strokes. Due to the nature of cast iron, the glow plug system is not enough to heat the cylinders and the head when the temperature of the engine is also 30℉ or below. Ford recommends using the block heater any time the temperature is below 30℉ for easier starting. Many climates can run 15w-40 all year round without issue but for others you may need to switch to a the proper recommended colder climate viscosity to run during the fall and or winter until things warm up. In the very cold climates where the ambient temperature remains under 30℉ Ford recommends SAE 5W-30 oil, and in extreme frozen conditions where the ambient temperature is below 0℉ the recommendation is for SAE 0W-30 oil.įollowing the temperature recommendations means that it may be necessary to switch oil viscosity seasonally (think summer vs winter) in some climates with a wide temperature range between seasons. If you are in a colder environment where the ambient temperature never gets above 90℉ but stays above -10℉ Ford recommends SAE 10W-30 oil. Ford’s standard recommendation is SAE 15W-40 oil which is suitable for climates with ambient temperatures above 30℉. The acceptable SAE Oil Viscosity for the 7.3L PSD depends on operating temperatures. Motorcraft Super Duty Diesel Motor oil is the recommended brand by Ford. In an engine such as the 7.3L PSD which utilizes an oil driven HEUI injection system quality oil is even more important for the proper function of the engine. Using the correct oil for your engine and changing it as required is critical for durability and longevity of the engine. Oil is the life blood of any engine and choosing the right oil is important for proper lubrication to minimize friction and wear, provide cooling to internal engine components, and to help clean and carry away contaminants to be removed by the oil filter.
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