Cummins longevity and maintence

OK guys, need some sage advise from previous and current owners about scheduled maintenance. New to the diesel scene and I want to make sure I do what I'm suppose to...so asking for help. I've done research online, but I can only find part of the answers so I'm turning to y'all. The owner's manual tells me some of it, but are there any tips and tricks that can be shared.

So far I've found that there is an additive that I'm suppose to put in the differentials when I change the fluid since it's a limited slip, and I know that the old 7.3L Fords had something that was put in the antifreeze to prevent cavitation, but I can't find any information like that on current engine. Is there a holy grail resource site that can help?

Please fire away with all your help. Thanks

Follow the maintenance schedule in the owners manual. Many Cummins engines have gone 500,000 miles and some over a million miles without being taken apart. The engine will outlast the truck if taken care of.