Low Oil in Diesel Engine 6.6L

[Duramaxsky]

Make sure you use diesel oil. The circle should say ci. Compression ignition. If it only says si, spark ignition, it's not diesel oil.

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[redwngr]

FWIW, the 2.8L, the 3.9L and the 6.6L Dmax engines all use different oil specifications...

 

 

For the 6.6L:

 

Engine oils with the letters CJ-4 or CK-4 are required for your vehicle.
The CJ-4 or CK-4 designation can appear either alone or in combination with other American Petroleum Institute (API) designations, such as
API CJ-4/SL. These letters show API levels of quality.

To determine the preferred viscosity for your vehicle's diesel engine, see Engine Oil pg 90. 

 

Viscosity Grade
Use SAE 15W-40 viscosity grade engine oil.
When it is very cold, below −18 °C (0 °F), use SAE 5W-40 to improve cold starting. 

 

 

The additive package in oils for gasoline engines is different than for the diesels. 

If it was my truck, I'd change the oil sooner, rather than later.

[AK_ Maverick-X3]

Hey Redwngr,

Been waiting for your post. That was the plan to change the oil out. I haven't driven since the post. Planning on picking up 10 Qts full synthetic today - Mobil One 5W-40 for diesel with CJ-4

Thanks,

Scott

[AK_ Maverick-X3]

Changed out oil yesterday, thank you all for you replies.