I called Chevron yesterday and asked if i could use Delo 400 in my gas engine v-8 inboard boat. He said yes, but i didn't have to. All the reading i have done said i should use a deisel oil (CH) in my engine because it works so hard and is around a lot of moisture. Steve, at Chevron said to use Chevron supreme if it were cheaper. That the Delo 400 had additives for deisel engines that i would not use or need. He said gas engines don't need the detergents that the Delo 400 has. Has anyone heard of this?