I run 15W40 in my walk behind mower haha, it is just so cheap that we buy it in bulk so we run it in everything not just diesels. WE have not had a problem so far and have done it on lots of equipment for a long time, I agree it might not technically be ideal... but it seems to be fine for me.

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1976 300D 115 Blue Grey exterior 95K miles


2004 Dodge Ram 2500 Cummins Silver exterior 5"stacks etc...