If anything, Diesel rated oil is much better than automotive oil. It's additives allow it to keep the bearings lubricated under the stress of compression ratios of anywhere from 16:1 up to 22:1 or more. Most automotive engines have compression ratios of less than 10:1, and stovebolt engines struggle to get much motre than 8:1.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!