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Delo 15w40 for all my vehicles

I use Delo 15w40 in my diesels, But was considering using for my 2001 chevy truck with 4.8L v-8..Also in my 2002 chevy venture van with 3.4L v-6. Do you think this would be a bad choice? Is this oil to thick? If mileage makes a difference the truck has 148k miles, and the van has 60k. Or should I just stick with Havoline 10w30. Any advice? Thanks
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