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Straight Grade 40W Heavy Duty Diesel Engine Oil - 55Gallon

SAE40 Engine Oil (55Gal. Price: $300.00) 40WT. API-CF (Low Ash Content) oil that far exceeds the 1% ash content with a content of 0.78%. 

Detroit engines have very specific requirements for engine oil: 

1) use only SAE40 oil, no multigrade. If you're in an extreme northern climate you might use SAE30 in the cold of winter, but it's better to use a block heater to help keep the oil warm and use SAE40.

2) the oil must have a sulfated ash content of 1.0% or less, the more less the better. Any oil 1.0% or above does not meet the engine oil specs.

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