2016 prostar with cummins isx15

[JimT]

In addition to what Waterloo said, you'll want to check engine hours and compare with mileage to get a good idea how much it's been idling. More idle == lower DOC/DPF/SCR life. Chances are it's already got decent blow-by and some oil consumption, this in addition to a roughly 500,000 mile lifespan means the DPF/DOC *might* already be showing problems (more frequent regens, longer and/or incomplete regens). Unfortunately this is just a common thing with these emissions trucks in the 400,000-600,000mi range with typical fleet neglect practices.

As for fuel pump, that's a 2016 cm2350, most likely came with the updated plungers, meaning no one has opened it up, ever. On the plus side it's right at the perfect interval (400,000 mi) to be rebuilt or replaced before typical problems start to occur. If a rebuild kit/parts are available then your looking at a few hundred and an hour or so of your own labor.

I would definitely try to open the valve cover and visually inspect the cams and rockers. Their condition will give you a lot of insight into how often the oil was changed, how much soot was building up in the oil and if any debris found it's way up there and damaged the cam. If you see any damage in there either walk away or negotiate it down as low as possible and plan on an inframe. Metal debris flaking off the cams/rockers can easily find it's way into bearings and clog up the oil cooler.

Finally, go click on the link above called "My Book", there's a few chapters in there about what you look for when shopping for a truck and what kind of maintencne you should plan to do after purchase but before putting the equipment into service. I know if I had found that book/info before I bought my truck I could have avoided a bunch of problems that cost me way too much money. Probably still would have bought the truck, just would have prevented some tough lessons.

Anyway, if you want more specific recomendations then throw out some more info for us to work with.

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When it comes to Cummins engines, the biggest selling point over other manufacturers is the vast amount of information available to owners, free of charge. Just go register on cummins quickserve for free and enter your ESN and you'll have all the info you need to find parts and tear down and rebuild that entire engine.

If you go on to own a Cummins engine it's highly recommended you pick up a $300 Inline6 adapter from ebay with the Cummins Insite software so you can read codes and troubleshoot any problems that might pop up. Most shops charge about $100 for "computer diagnostics" so, with emissions intact, that adapter pays for itself in 3 uses. Find yourself a decent used laptop (with dvd drive and usb) that runs Windows 7 and you're all set. (Windows 10 works, but Win7 is just easier to set up as that's the OS that the software was originally written for)