Oil grades - If you prefer a synthetic lube oil, Detroit Diesel recommends a Mobil straight 40 weight synthetic marketed by Mobil under the Mobilguard SHC 1 brand name. We stock it in bulk for use in our service department, but it is also available in gallon containers from Mobil. The same product can be purchased from Detroit Diesel distributors under their own brand name.
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Hopefully this helps.
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