The Detroit Diesels REQUIRE 40wt oil, check the Detroit specs at <http://www.detroitdiesel.com/support/on-highway/manuals/Lubricants_Fuels_Coolants/index.asp>
I use Rotella T 40wt for the Detroit and Rotella 15-40w for the generator.
Troy Tikalsky
1986 Newell DD8V92
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