Detroit 2 Stroke Oil is engineered to meet or exceed API CF-2 specifications. Additionally, it provides superior levels of service beyond the CD-II category for 2-stroke Detroit Diesel Series engines 53, 71, 92, and 149. The newer Detroit Diesel designed engines recommend single viscosity engine oils that are formulated to have less than 1% sulfated ash.
It is important to know the sulfated ash of an engine oil’s additive chemistry. Because it can predict whether too high of a sulfated ash could cause valve distress during certain operating environments. Sulfated ash typically will be based on the Total Base Number specification. This TBN number is a measurement or rating of an engine oil’s ability through alkalinity to neutralize acids formed within an engine. The higher the Total Base Number, typically the higher sulfated ash content. Motor oils with Total Base Numbers greater than 10 will have sulfated ash amounts greater than 1%.
It is important to understand that Detroit 2 Stroke Oil can safely be used in engines burning fuel with less than 0.5% sulfur content. If fuels are being burned with a sulfur content higher than 0.5% sulfur, it is better in SAE 40, which has a Total Base Number of 15. Because of the higher sulfur quantity, a higher Total Base Number is required due to higher amounts of damaging acids being created during the burning of higher sulfur-containing fuels.
For 4-stroke cycle diesel motors, a higher Total Base Number is critical in controlling unwanted deposits and the need to neutralize corrosive acids due to higher sulfur quantities in diesel fuel. In the case of 2-stroke cycle diesel engines, Detroit Diesel is recommending engine oils that are formulated with sulfated ash contents of 1% or less, and having Total Base Numbers ranging from 6 up to 10, and burning diesel fuel with less than 0.5% sulfur content.
At the start of 1994, the EPA mandated that on-the-road diesel engine vehicles were limited to burning diesel fuel containing a maximum sulfur content of 0.05%. Because of this new diesel fuel standard concerning sulfur content, the requirement for higher TBN rated engine oils for on-the-road highway Detroit Diesel engines stopped being a problem in the US, as long as the owner/operator bought diesel fuel meeting these strict specifications. It should be noted that off-the-road diesel fuel could still contain much higher amounts of sulfur content. If this is the case, then using higher sulfur content diesel fuel for off-road vehicles demands that the proper engine motor oil with a higher TBN rating be utilized.
For extreme cold temperature weather that may cause insufficient starter cranking speed when using SAE 40 viscosity, such as 0 to -25 degrees F, then the better choice during these colder temperatures would be SAE 30. This lower viscosity oil will improve starter cranking speed. Also recommended would be SAE 15W40. As soon as ambient temperatures rise, then go back to the Detroit Diesel motor oil of SAE 40. Important to note, there is an exception to this. For 2-stroke cycle marine engines or Series 149 engines, DO NOT UNDER ANY CIRCUMSTANCE USE 15W40 or SAE 30 motor oils.
Detroit 2 Stroke Oil is a superior oil because of how it has been formulated in keeping the engine cleaner than other low ash commercial engine oils. It accomplishes its superior performance due to its higher quality detergents and dispersants that create a far superior oil additive package. This high performance additive chemistry is blended into highly refined base stock oils. These base stock oils have gone through multiple refining processes, the end result being base oils that accept these high performance quality additives. The benefit resulting in a much cleaner engine.