GM 3-71/4-53 motor oil.

The Chevron brand that Detroit Diesel recommends is DELO 100 40wt. I think Shell makes a similar formula. I have a TSB that Detroit Diesel published and sent to all their distributors and dealers that this type of oil is to be used.

Multi viscosity oils will cause a lot of slobber both in the exhaust and air box plenum. If you're using this oil, make sure the air box drains aren't plugged. Also, frequently remove the air box covers to keep an eye on the internal slobber that is created by using this oil.
 

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